Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef610a91ab5b54…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 18:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6ff6a966347114e0513e4183312b887 SHA-1: 207db3eea7ffc846c4433ae4ae3bda6bf5a71e8c SHA-256: 42ef610a91ab5b543d750a9e4b25d7247e7215bb91bc759a0ddacc73473958f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=reckless+racing+3+free+download
    • http://wccflooring.com/userfiles/files/63220305900.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/93676220382.pdf
    • http://ceroki.com/image/files/65765618845.pdf
    • https://gdaniec.com/upload/files/80059960776.pdf
    • http://holidayservicemarsala.it/userfiles/files/17562269782.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/91799626875.pdf
    • http://revucue.com/ckfinder/userfiles/files/wipewoxumedup.pdf
    • http://klusjesindex.nl/images/uploads/69465587937.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/samibimop.pdf
    • http://karpatskiles.ru/store/files/95475278391.pdf
    • https://living-stone.lu/userfiles/files/93429617996.pdf
    • http://cabini.it/userfiles/files/zotifalemozulemesex.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/xujudojunekesajifekixed.pdf
    • http://fivelscope.net/fckimages/37154437210.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/894625565ab9761073e636eccc0ed68e/20466693612.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/foworedigenimi.pdf
    • http://verzorgingsindex.nl/images/uploads/19040718142.pdf
    • http://stonebreaker.at/25260782700.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5a0e286e---38311461298.pdf
    • http://kristiankutschera.de/userfiles/file/zitivutizikimixiturolobof.pdf
    • http://kwartetproforma.com/userfiles/file/nijidowufonujir.pdf
    • http://viorina-deko.com/images/file/26229596755.pdf
    • http://computerdoki.hu/user/file/48409160148.pdf
    • https://st-stephens-church.com/upload/File/donawebudetufivupelu.pdf
    • http://wib24-admin.de/uploads/file/goferunogej.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_off0000c335.bin
1837a87e3f0b3491cc430879eec77841cc7165fddd19541032f5f64b4d6d9345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 18708 bytes
font_01_sfnt_off0000f49b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16792 bytes
font_02_sfnt_off00010cb2.bin
9d62df1a87cea88c11e785f0ca3e38843b46b3e2d4f62bd52a3c5e9363513159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10948 bytes

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