Amir Azari top-scored for the West Asian side with 18 points and 6 rebounds.
The duo of Bardiya Khosravi and Alireza Rashidi scored 14 points each and hauled down 10 rebounds combined, while Yasin Morovat Halabi and Mohammad Benia added 12 and 10 points, respectively, in the victory.
None from Kazakhstan was able to score in double digits.
Iran, who had defeated Saudi Arabia 87-43 in its first match, will play Japan on Tuesday in Group D.
The tournament is taking place at the M bank arena and the Buyant Ukhaa Sport Complex in Ulaanbaatar, Mongolia, from August 31 to September 7, 2025.