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

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.

They claim to have more than five million Qantas records including full names, email addresses, phone numbers, residential addresses, dates of birth and Frequent Flyer numbers.

The incident highlights a level of sophistication from the criminals, but RMIT cyber security professor Matthew Warren says they may not be responsible for

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