Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be34b672a9c75d5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 23:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41b66679f9c2ea6fd2181db6b6664f49 SHA-1: 92d4f73b45b11149cd5efbce93ca78ceab5866ce SHA-256: 8be34b672a9c75d54d0f7d74ebd02934d0e4d497f8d724018c28f07cc5685d6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm on disposable domains, likely to distribute further malicious content or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://meskerjager.nl/media/files/85260835027.pdf
    • http://bxbrdh.marketsearching.com/upload/files/16836054192.pdf
    • http://15441707.com/data/board/file/20210916002136.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/92754885666.pdf
    • https://damsindia.org/admin/uploads/file/wuzulavevux.pdf
    • https://powermailer.in/userfiles/file/60435619467.pdf
    • https://stopserv.ru/files/file/mawagirase.pdf
    • http://ainut.fi/userfiles/file/69124171405.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/56588058056.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vuxiwigeferebegimitog.pdf
    • http://likuidart.com/files/ckeditor/files/wurajeruvarixopituvivutun.pdf
    • http://demenagements-remond.fr/userfiles/file/20210906134711.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/14823326185.pdf
    • http://lnv-cnc.com/userfiles/file/nigurisigegewozamadagozok.pdf
    • http://kelvista.lt/images/files/18090830743.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/mejezagesod.pdf
    • https://nslogisticservice.com/userfiles/files/12630797779.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c77c6dcc7bc6ad08c6f369ba576a36f/60104412527.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/42281755887.pdf
    • https://sunarchegypt.com/userfiles/file/76641250018.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ba0e101---13217542233.pdf
    • http://njbeihang.com/uploadfile/file///2021090305065962.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/99495595034.pdf
    • http://takramaipai.com/mypicture/file/gajinenudatekogetuwi.pdf
    • http://ed-web.cz/userfilesfile/40016043892.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hello+neighbor+demo+apk
    • 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_off0000d902.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
font_01_sfnt_off0000f114.bin
2fc2e16fcbe2b3413570fb5fd22d8bbf13b138c3cc4f2c2f7c83e33094b461fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 19436 bytes
font_02_sfnt_off00012403.bin
88fa4de64775b0f9537e7415d4882ab11eba62f6310c23e3327e3b0cf802c617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 10796 bytes

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