Criminals are threatening to release extensive details on more than five million Qantas customers. Photo: Dave Hunt/AAP PHOTOS

Criminals threatening to leak personal details of millions of Qantas customers might not be the group behind the data hack.

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Australia's largest airline is among 39 major companies including Disney, Toyota and FedEx caught up in an international extortion incident.

A group named Scattered LAPSUS$ Hunters is holding their customers' data for an undisclosed amount and threatens to release the information on Friday unless the companies enter ransom negotiations

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