Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df9509a112a3df3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 06:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 075d6f32928647ac858685529de6dc7b SHA-1: 902db5fb128d358e8e0b9227647a0878e63485a0 SHA-256: 8df9509a112a3df3642fd55de437aa4f03b66a43830b95898606edfea8e242b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to host malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=essential+elements+alto+saxophone+book+1+pdf
    • http://tamakar.tech/298819042329sniz.pdf
    • http://helpcenter.business/velokebumejuwupubopop8kz4.pdf
    • http://onlinetiser.website/194712376271t294.pdf
    • http://workshop-fb.ru/899598433715582a.pdf
    • http://pusikoxelumide.iblogger.org/95872670519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tamupevex.rf.gd/76540851141.pdf
    • https://s3.amazonaws.com/mipeboro/18_mustang_gt_auto_vs_manual.pdf
    • http://moferamobonar.epizy.com/night_portrait_photography_settings_canon.pdf
    • https://s3.amazonaws.com/liwara/mapa_provincia_almeria.pdf
    • http://gozuketitara.onlinewebshop.net/sat_physics_subject_test_questions.pdf
    • https://s3.amazonaws.com/wenobagupexekap/76576353685.pdf
    • http://gevewodex.epizy.com/67802836631.pdf
    • https://s3.amazonaws.com/sivanira/alienware_keyboard_lights.pdf
    • http://wowadepadon.rf.gd/whiter_shade_of_pale_sheet_music_free.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_af7472b4f44549a88d9c0e35cb1e27b1.pdf?index=true
    • http://novogizeboje.myartsonline.com/dawugawudogo.pdf
    • https://s3.amazonaws.com/purixifusipelid/schizophrenia_guidelines_usa.pdf
    • https://s3.amazonaws.com/ruzumeb/49256242716.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_bc073b74fc444d1d9a71e38d080e83f3.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/dugurelun.pdf
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_e438233b43f44b519d4da7fe48491067.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea5.bin
9d9134bbc7f811e9cbf6729f6804811fd86769ea8bf36320a1eb2a36fb4c909f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 5468 bytes
font_01_sfnt_off0000f11d.bin
5911fe6e004d8217c0dfeebc8189b4203bd437f8df9fb3c68e260435efc4d455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10944 bytes

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