Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32e1e56ca40080c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 16:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85c101bee32f59922dd46a2e91fa3e1a SHA-1: ed2f70867bb468472ca3b38e91350a59c4622ea9 SHA-256: c32e1e56ca40080cc25a5c7e34d9d7e04a7a6c54c4fe59eab93d0850d648da67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and numerous external links point towards an attempt to trick users into visiting potentially harmful websites.

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://ketchas.ru/uplcv?utm_term=x+plane+full+version+free+download+android PDF link annotation
    • http://kxqcgs.net/filespath/files/20210926045740.pdfIn PDF document text
    • http://vipdiler.ru/files/file/65222434707.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/verozasufewo.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/wododanu.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/40541473035.pdfIn PDF document text
    • http://chamdure.com/DATA/files/navub.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/nelijaxofikuf.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/99311679814.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/lerepavepesugubelopa.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/49327835992.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/nokol.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/akuxubadexukukiko.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pegisajefabusima.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/55256774090.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/3821388774.pdfIn PDF document text
    • https://pecintajp.com/contents/files/zujivujepezal.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wamumepojoz.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zejiteniwi.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/toruwupapuguvuvotev.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145fb2845a76---52260368501.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/59778807913.pdfIn PDF document text
    • 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_off0000b2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 17240 bytes
SHA-256: f7ecdadced736ebd9e5f8a282edeca883d514bdd5813fd8e58b166849452ae45
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 10652 bytes
SHA-256: cc17ef7b4c289e706ccc8a97601588a51d920b4e5ebe353348b11e54bc8a6088

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