Burks, who came off the bench Tuesday to score 24 against the Lakers, hit 6-of-10 from the field and knocked down 13-of-14 free throws.
Burks and Gordon Hayward combined for 24 points from the free-throw line in 26 attempts. Hayward ended the night with 17 points, seven rebounds and seven assists.
All five Philadelphia starters scored double figures, but the Utah bench outscored the 76ers' reserves 56-10.
Philadelphia tied it up 66-66 with 3:53 to play in the third quarter, but the Sixers' shooting went cold and Utah extended its lead to 14 points early in the fourth and held on the rest of the way.