• Sublime Core Feed

Description

This rule detects DocuSign logos within PDF's that do not link to reputable domains, nor docusign themselves. This is typically indicative of Credential Phishing.

References

No references.

Sublime Security
Created Feb 3rd, 2025 • Last updated Oct 22nd, 2025
Source
type.inbound
and any(attachments,
        .file_type == "pdf"
        and any(ml.logo_detect(.).brands, .name == "DocuSign")
        and any(file.explode(.),
                length(.scan.url.urls) <= 9
                and any(.scan.url.urls,
                        .domain.root_domain not in $tranco_1m
                        and .domain.root_domain not in $org_domains
                        and .domain.root_domain != "sublimesecurity.com"
                        and not strings.ilike(.domain.root_domain, "docusign.*")
                )
        )
        and any(file.explode(.),
                any(ml.nlu_classifier(.scan.ocr.raw).entities,
                    .name == "org" and .text == "DocuSign"
                )
        )
        and any(file.explode(.),
                any(ml.nlu_classifier(.scan.ocr.raw).entities,
                    .name == "request"
                )
        )
)
MQL Rule Console
DocsLearning Labs

Playground

Test against your own EMLs or sample data.

Share

Post about this on your socials.

Get Started. Today.

Managed or self-managed. No MX changes.

Deploy and integrate a free Sublime instance in minutes.
Get Started