Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45419661ad64f2c…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 09:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1bce715e0f91037865836154af52d10 SHA-1: 14c7f4e2e9e8b37f0de966a4dccfd9d743812f51 SHA-256: b45419661ad64f2c244e28c35550d1f27970dab9f5e28e36a479f8b0f761454b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://markmont.eu/editor_uploads/system/files/nerugunidefitekofewesifi.pdf In PDF document text
    • https://kermiradiatoriai.lt/images/files/wigikadusi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144c84277aa5---jimugixikopiziziwinov.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/28600081430.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pizosujejemoziwipeneru.pdfIn PDF document text
    • http://umhouses.com/uploads/files/65921440528.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/bitupusakizitud.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/87348005034.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/donenoxojubuzuxekom.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/muzevumux.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/35217875074.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/46340383936.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lubovepewapoge.pdfIn PDF document text
    • http://www.pilartangguh.com/file/vebaluxizisamiwodez.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/lokosizozov.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/14431059700.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/bimodigugazebejekututi.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/71580161315.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/65733667942.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fadidix.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457e6fd43c5---55446534100.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/54069636875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mortar+in+cookingPDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16876 bytes
SHA-256: b5940cc77fb29a6303c7aa5ea80027d2e98f388b414ce58da3b4588128edb5f3
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10144 bytes
SHA-256: 8a1f0d45fd65cdec8bc465355b5a9063dfed1d8e90b40a9c65b22a923cd3b751

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