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Employees who have been trained to look out for phishing emails know not to click on links in suspicious emails. But what if the email tricks them into clicking on a link they didn’t intend to click on because it’s invisible?

According to a presentation by the security education firm KnowBe4, one of the newest forms of email compromise is a type of clickjacking which incorporates an invisible link (using the opacity setting in CSS). The link is instead replaced by a “bothersome” graphic element that’s made to look like a small hair or a speck of dust just like this:

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