Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f22de6ede762b1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 086d2357c61fc5a22795187b17c32441 SHA-1: 233d81f4abd2ee11a3fbfcbe9181090ad32f9a63 SHA-256: 67f22de6ede762b1a73714a4805160df1b3cbb594eceb0ef689be8a41cb9fa68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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
  • 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 https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/29347716942.pdf In PDF document text
    • http://wdnederland.nl/file/62404395447.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/3061075714.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8f0a8a336bbf76b996573cff1bb4b61e/30254987728.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jekubofulakaviro.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kokifavipanuvunanojig.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89394966494.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/80370520955.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/giwapekuwemo.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/dusep.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/70481630692.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/10235058762.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/97111108908.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/lalalevalagiperalil.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/naxamewumelilaripegemusok.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/33140016243.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_145117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+extensions+in+chrome+mobilePDF 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_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 17684 bytes
SHA-256: ea1a34d78accacef738479976a79a6a692b1ad78ebb2dc15d7cac9618d54a780
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10752 bytes
SHA-256: 8c78bffce744b2552d2810b166506bca1f2209d4cf4069058f4fc918257d8245
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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