Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4701b29543d877…

MALICIOUS

PDF

52.4 KB Created: 2021-10-06 06:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4870cb39dfec99540db1bccd82247228 SHA-1: a502c8a85856f1ba2ea7f3ce81e69fd6bc75cd4c SHA-256: 8b4701b29543d877822d7fdf984deef9abc15b22e8508820aa5fabb7cd6e320d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7185

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=cache+memory+questions+answers PDF link annotation
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/pidalitisokotewupidimo.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pijegezexevosesurav.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/27334487051.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/49872287613.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161364d281d5c0---33293534907.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/81897548587.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/79661414120.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092604211873499.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb4f79eff23b56b48a5a5c02d219a1aa/povibapoxedi.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudiwakoxaw.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/pezifewatejotupevisuzage.pdfIn PDF document text

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