[aflaba]

I think you might have the best hand.

UTG does not need to have anything. The bet on the river means nothing. The avarage player would call with "plenty" of hands on the flop.

SB might have something, but he might also just be trying to increase his share of a probable split pot. (Since the pot is so small I don't think that would be a good play by him).

I don't think you have the best hand often enough to win. 2:7=1:3.5=22%. But I'm not sure. Uncommon and awkward hand.