Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a05422c4e8895b…

MALICIOUS

PDF

56.8 KB Created: 2021-09-21 07:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63a739eef706e32813eab3b5bc0fdcab SHA-1: d1f21bcdb9290181dc3ccb4c0371a3be70d8c126 SHA-256: c9a05422c4e8895b2a1e4568440c53a48ff3fe0f1c9650903ff79882df619f45
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to various external sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7374

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://ketchas.ru/uplcv?utm_term=how+to+search+my+android+phone PDF link annotation
    • http://tantos.jp/js/upload/files/luloganuzifivo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/99748084293.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kosipinamirupivasuvane.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/12336739693.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7fd51bee7b1fdc836db8fa259690dbb1/2506486695.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/memuwagodorin.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/rutame.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/06677dfea7ff8006540168052ad6577c/51151453236.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210916042154.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/86643843935.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/bomanejaxonuferelodili.pdfIn PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/1733507060.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/12055313164.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/99150591655.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/xanimur.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2584854028.pdfIn PDF document text

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