You appear to have the correct pot odds
to call. There are 46 bb in the pot after the utg raise. You only need to invest another 9bb to see the turn so you are getting 46/9 better than 4-1 and its possible the sb will call along with you making the odds even better.
Hitting a 9 or a ten might also be good enough. Either player could have 55 66 77 as played.
I would be happy the SB nit is still there, you have to consider him but he has been passive so far and not shown any reason as to why he would raise. He is the person you might win some more money from if decent cards come later in the hand.
Call and be happy about your good expressed pot odds, re-evaluate after the turn.