Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3f9532c1986642…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 13:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96c8596772faeddfb3e37472d71d5c14 SHA-1: 444a82780f6befa6bf36dbb4e4e769dabb1ab379 SHA-256: 7a3f9532c19866422bd8af93d1230da665df22e5d56b9267ad2a723fd63f250d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the URLs, suggesting they are used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=dont+kill+your+boss
    • http://artecgroupservices.com/imagenes/file/46936779509.pdf
    • http://emannsltd.com/userfiles/jaxezejosopoxos.pdf
    • http://showpalmedical.com/userfiles/95599032822.pdf
    • http://hennel.hu/sources/elemek/file/vodiluvabozejawomajuker.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/noribonofe.pdf
    • http://hoya889.com/upfile/files/20210908083103.pdf
    • https://abss.pt/userfiles/file/milumar.pdf
    • http://rosniyom.com/userfiles/files/tinawewuriledivoboxari.pdf
    • https://fivetc.net/uploads/files/34455031060.pdf
    • https://iphone-odklep.si/vsebina/xidazawiku.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e42204462---46480375770.pdf
    • http://daisytalavera.com/userfiles/files/mekubuwumebijowuxutofamo.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/56325a512c175bb4ad51bc4040c9141c/78246413351.pdf
    • http://nexxstep.nl/userfiles/file/wexetanotejurolupofodiwi.pdf
    • http://tlxzkj.com/uploads/file/05110614850.pdf
    • https://nieruchomoscikomercyjne.co/files/file/67734708724.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/89190713307.pdf
    • http://viviapalermo.com/userfiles/files/nuwokinurigijofilop.pdf
    • https://berettyotv.hu/userfiles/files/93313232452.pdf
    • http://detikakdeti.ru/img/file/44705515475.pdf
    • http://bifruit.mk/ckfinder/userfiles/files/bulevad.pdf
    • http://poledance-chrudim.cz/files/file/21723173796.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_off0000b058.bin
76ed3ed2151f8f39c8616ebd2eb7ff5b073325af67f8da221822fd632536212c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB058 10256 bytes
font_01_sfnt_off0000c784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC784 16792 bytes
font_02_sfnt_off0000df96.bin
fe34af9ee603fa3c8424685d429b823e52373aa9f5d853a3c063388ce649e81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 15712 bytes

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