The goal of the day, which keeps Iran on top of group B, was scored by Karim Ansarifard, who thereby increased his overall goal tally to two.
The Saipa Karaj striker vollied a pinpoint cross from Gholamreza Rezaei into the net at the far post in injury time of first half.
In the other match, Turkmenistan booked an impressive 6-2 win over Vietnam, who had already scored a 3-1 victory over Bahrain in their opener.
Iran's U23, with the three overaged players Mehdi Rahmati, Jalal Hosseini and Gholamreza Rezaei, will take on Vietnam on Friday next.