Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb8a49aaad8c95d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 09:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66942f0333f5ab1add751918684bddb0 SHA-1: 62ace8b317fbe36e6aea8553202ca0d6077c183b SHA-256: 8fb8a49aaad8c95d15e8cce36508191eccd39ac234a406b6b5ab4c681be406d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The file likely serves as a lure to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://archism.ru/uplcv?utm_term=android+to+mac+airdrop
    • http://thietbidienmpe.net/upload/files/94269346572.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/60219141445.pdf
    • http://foto-recepty.sk/images/fotky/48701944824.pdf
    • http://charolais-hessen.de/write/userfiles/file/sopusiguwabobuvov.pdf
    • https://magatek.com/documents/file/11475717560.pdf
    • http://maurovalleferroarchitetto.eu/userfiles/files/zemadimenixetubo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/678d8e79faeda09cd17d81d3e62efc44/85108158080.pdf
    • http://chinalabware.ru/d/files/88741722680.pdf
    • http://kmkonsult.cz/userfiles/file/9134110406.pdf
    • http://ecole-belair.com/ecole/file/wezilebesirolomet.pdf
    • http://geo-equipe.it/userfiles/files/govatumodavumaburuxukis.pdf
    • http://www.colormotion.cz/UserFiles/file/49785001113.pdf
    • http://abwvictory.com/uploads/files/54776381226.pdf
    • http://drironcat.com/images/file/banefir.pdf
    • https://belretail.by/ckfinder/userfiles/files/29039040412.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/39491111600.pdf
    • https://keongracun.org/contents/files/bamujabadalesopunulutasu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ku6g6m59a0k2ua516jel7vhvc2/vibajowu.pdf
    • http://doktor-okonski.pl/uploadimg/file/todulik.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/96325704429.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/89835765969.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07b.bin
043558b01dca5cc2c92cba0fdababb9f6bf340707d1bc2c25ef9f9905d228bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 10308 bytes
font_01_sfnt_off0000c7a8.bin
20bdf1549f41c87fa803ebc9cfb5d202bf3e1857b9732a7ac66ff224c2847bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 17196 bytes
font_02_sfnt_off0000f3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes

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