Nestor Ortigoza pulled one back for Paraguay in the 82nd minute with a header at the back post but Perrin's side hung on for the morale-boosting win in Changsa, south-central China.
The 2004 Asian Cup runners-up have lost only once in seven games since the French coach took charge with wins coming over Macedonia, Kuwait and Thailand as they continue preparations for January's edition.
They have been drawn in Group B of the 16-team tournament in Australia along with Uzbekistan, Saudi Arabia and North Korea.
(Writing by Patrick Johnston in Singapore; Editing by John O'Brien)
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