Malicious PDF — malware analysis report

Static analysis result for SHA-256 104b94a6f5b0c828…

MALICIOUS

PDF

82.0 KB Created: 2021-10-04 17:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e748e374b0275367d36a24b6d509d95c SHA-1: 19ba6ee2c8b416549bd0670c12f07b91b66ec90b SHA-256: 104b94a6f5b0c828d91455da6beb3528cfeffc4a3ee8657e1c7621407e8a8f71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dataction.org/demo/dataction/media/fununovu.pdf In PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zalisofupokojoso.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/1849904668.pdfIn PDF document text
    • http://gosapahostel.com/userfiles/file/94175715123.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mozeki.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/98464192093.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/87777755027.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/pugepijevivivumami.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8fb84c624---ratepekukudowatunu.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/boxutagadisowupobapesif.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/zokuvenevag.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/91329966214.pdfIn PDF document text
    • https://equinox-e.com/upload/files/ziroxelageg.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/5650238794.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/52201357564.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gebezexi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16133988756418---1056513392.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/33698088929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is350+manual+transmissionPDF 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 10616 bytes
SHA-256: 5c89bbc73912415b345d02dfce8ee223c3d7ea31b113e5801c813bc766949fc0
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 19380 bytes
SHA-256: 58267f31b576a5f4dce52f73e0881f042dd9970a799338a4089a97d03719cc9f
font_02_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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