High Severity

Attachment: PDF with View RFP Document lure with external link

Description

Detects inbound emails containing a PDF attachment that references a 'VIEW RFP DOCUMENT' lure and embeds a URL pointing to a domain that differs from the sender's domain, a pattern consistent with document-based social engineering used to redirect recipients to attacker-controlled infrastructure.

References

No references.

Sublime Security
Created Aug 27th, 2026 • Last updated Aug 27th, 2026
Source
type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            any(.scan.strings.strings, . =~ 'VIEW RFP DOCUMENT')
        )
        and any(file.explode(.),
                length(filter(.scan.url.urls,
                              .scheme != "mailto"
                              and .domain.domain != sender.email.domain.domain
                       )
                ) > 0
        )
)
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