He almost got his second of the match five minutes before halftime but his shot was saved and Neymar tapped home the rebound to make it 2-0.
Brazil were missing nine players who were not released by their Premier League clubs but they were still too strong for opponents who had never beaten them in 12 previous World Cup qualifying matches.
It was the ninth home qualifier in a row where Brazil have kept a clean sheet, and their eighth win from eight Qatar 2022 qualifiers.
"These three games we lacked a lot of players that meant others had a chance and they stepped up," said captain Casemiro. "I think we are on the right track.
"We've won eight in a row, that's a record and though we are not mathematically there yet we are thinking about the World Cup."
The top four in the 10-team group qualify automatically for the finals and the fifth-placed side goes into an inter-regional playoff.