Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf95f7fe098056cb…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 14:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af8e3eb2b55a59ef472620cec5bee34c SHA-1: c56798dbd3cfb2c35beb6f0febdd98ab43d798f1 SHA-256: bf95f7fe098056cbf15dbec81ab1c5d8a1813773511a657e31a3dee66ed69250
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample for using disposable hosting and UTM parameters, common in phishing and spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://sujoydhar.com/userfiles/files/24510183979.pdf In PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/mebaj.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/58717879091.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/4647885965.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/3668525107.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/68773560588.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210915_180433.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/zotazudilidozoz.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/guvoxekigevawenatugo.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/98558521687.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/luxigopimaxekoweta.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/79565727278.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/32173964555.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/natatiwiparigovapekilab.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/kolibekozizeruxobusiwux.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/lilidijitonusanewa.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/48807830140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+file+4th+edition+pdfPDF 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_off0000ac4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4E 16604 bytes
SHA-256: 5cbbf06e25a909f23d74b210f7fb74e8b54e8c0ebf96d0d528ca0deb102242cb
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10576 bytes
SHA-256: e7d0bd41d88f136a7d20cd73e8d7184b57b3b8f307f930bcd6b0c4d0ab56e5b7

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