Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06bc8c7768e7079…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 19:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e202684316dbef5be948fcee2c4e1831 SHA-1: f6af79052e6362a18b891b25c6dfe428071e69ca SHA-256: b06bc8c7768e7079eb6b314abcf6e8d3133a048e79e27363053379eb08539629
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were directly extracted, the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious sites or initiate fraudulent contact. The document body was unreadable, but the heuristics strongly point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ks-system.co.uk/ckfinder/userfiles/files/donule.pdf In PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/levenoxapifaviwatev.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/xezafeg.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/juvobawegira.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/9126466083.pdfIn PDF document text
    • http://platcometals.com/images/file/27692676861.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/11182715525.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/vowidepu.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/61559640338.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/gumafup.pdfIn PDF document text
    • https://kratky.eu/files/file/vipinesinazanuwegotexone.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajobufinulogufer.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jozevuravima.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/mevituxiweregigezeximi.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51977562154.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/nenenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gmail+account+on+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 10748 bytes
SHA-256: 0679ab75f7ba1bd8dab087fb736228f640a07d9cf8b086f38b70a1f8793c9bc8
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 18396 bytes
SHA-256: e45ac3c48dbc97a93b06f2631aaa75131f56a0aed6bbaf0f630e9996bfd89f27
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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