Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbb904799647bc9…

MALICIOUS

PDF

38.6 KB Created: 2021-09-09 06:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8caa3f6ee0421266ed7be36739b9563f SHA-1: 9720159bfa1a2db249279f060494d94fbc4d7d21 SHA-256: ebbb904799647bc9cfe02f0a076f12b39d62fb48478a338626a486ca294ebb67
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking an embedded link. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document hosts numerous links on disposable domains, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8da2a9ab---98975762746.pdf In PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908051202.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-02-07-16-52-41.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/forisojaxini.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210902_070655.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090515374093770.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/9755631776.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/82622329360.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/94310250489.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/jexuwojigukufadifotox.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/79072772875.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109090504154861.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/zimuxut.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/16604192263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mcpe+derp+skinPDF link annotation
    • http://irodori.kir.jp/files/file/39731048936.pdfIn PDF document text

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