Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ceb92e382fc050…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 20:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c7e78cf1b2f3bf487b7b812020a0be8 SHA-1: 57201394dda4f2cf3c33aa256af4cfc81b69b414 SHA-256: b2ceb92e382fc050ce3934b28a6b5f747654a937c5ac7e4dcea32aa5a5479313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDFs hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious intent. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://extintoresorigen.com/images/editor/67409550415.pdf
    • http://laserinnsbruck.com/static/sudusugas.pdf
    • https://myclubowners.com/userfiles/files/2326365924.pdf
    • http://sgrappresentanze.eu/userfiles/files/54682489266.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614228c68f17a---61264710280.pdf
    • http://rickgrisolia.com/userfiles/files/nabedo.pdf
    • http://soft-pro.hr/upload/datoteke/90282731999.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jonozuzu.pdf
    • http://fructusartis.com/i/File/41697351675.pdf
    • http://stihoplet.by/upload/editor/files/92665548501.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/bojaseges.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xemeroxerijemosowavanemas.pdf
    • http://nesemlak.com/test/images/uploads/files/38795942503.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210919200141.pdf
    • https://zlato-stribro-investice.com/upload/files/wutunufopa.pdf
    • https://pensionradvanice.cz/res/file/31550990566.pdf
    • http://premiercontractinginc.com/files/file/samekenusufudipudeporuz.pdf
    • http://formpart.com/upload/ckfinder/files/wuxumojitozatotikofala.pdf
    • http://palirna-frydek.cz/uploaded/file/teleripimiramam.pdf
    • http://brilspa.ro/userfiles/file///xuvepujikojovefani.pdf
    • http://tianlanip.com/filespath/files/20210911182515.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/948c201f93cfb8962a562c0126605bda/74410988641.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+testing+framework
    • 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_off0000cf2f.bin
4425398fae0eeca5bf350f1d92364f65479d893cf2f9c6f5e8c845ca5520613f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 18608 bytes
font_01_sfnt_off0000fff1.bin
9af58f5d28e51ef6c9aaa0e1da18b697c5e0a290b86df2a118dc17ba4219e7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10808 bytes
font_02_sfnt_off000118c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16792 bytes

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