NL50 on stars: Villain is 23/7/ over only 27 hands. No real read on him, complete unknown. Should I fold the river push????

Poker Stars $0.25/$0.50 No Limit Hold'em - 9 players
The Official 2+2 Hand Converter By DeucesCracked Poker Videos

UTG+2: $50.00
MP1: $51.30
MP2: $52.75
Hero (CO): $53.00
BTN: $91.55
SB: $50.00
BB: $50.00
UTG: $43.55
UTG+1: $50.75

Pre Flop: ($0.75) Hero is CO with 9 9
UTG calls $0.50, 4 folds, Hero raises to $2.50, 3 folds, UTG calls $2

Flop: ($5.75) 5 Q T (2 players)
UTG checks, Hero bets $3.50, UTG calls $3.50

Turn: ($12.75) 9 (2 players)
UTG checks, Hero bets $8, UTG calls $8

River: ($28.75) 7 (2 players)
UTG bets $29.55 all in, Hero ???????

How are we supposed to deduce this without stats

Searix, I just updated the post after you initially responded. I accidentally posted it before including all the info. Still no stats though, urgh.

Snap call. You only need to be good 33% of the time and he has a TON of hands in his range here. You might be slightly behind here in the long run, but you def still have enough equity to call.

correct! I snap call here as well.

Villain seems not to be the most skilled player on the planet from what i see.

1) sitting there with ~85 BB
2) his stats
3) limp/call UTG

and his line doesn´t make sense at all and you need 33% equity to win here.

First of all let´s have a look on what hands beat you:

KJ: his most likely holding here, but he should try to get it in at the turn
J8: don´t really see him limp/calling and calling the flop
86: don´t really see him limp/calling and calling the flop
QQ: don´t see him l/c pre
TT: don´t see him l/c pre, if so i see him c/r flop or turn and if he is scared of the straight his shove is just stupid

Now the hands you beat:

Qx type hands: KQ, QJ, QT, Q9
Tx type hands: T9, T7
pockets: 55, 77

As said before you never know what hands fish like villain are capable of playing but in the long run i see a call is profitable

Grunch: You beat so much here tat you have to call espec getting 2-1 on a call.

Arr in baby.