Malicious PDF — malware analysis report

Static analysis result for SHA-256 9241d6c562960fa6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 012d357b25c56de485278a3fa8f24f51 SHA-1: 86a661ed1c5799052a3db48df8f3ab21fe7104e6 SHA-256: 9241d6c562960fa652eac46817fbb2ac483d99270034dcf56e4d08793f7d815c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely to redirect users to phishing or malware sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely serving to download or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://equimat-cheval.fr/file/sobiketapezafe.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/zuxavir.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/wefodusizikidufexisusazi.pdf
    • https://spvi.cn/filespath/files/20210914085148.pdf
    • https://agronlogistics.com/userfiles/files/vagepabu.pdf
    • http://erh-hu.com/userfiles/file/tekewino.pdf
    • http://lgassociates.in/uploads/vafoxasujemox.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/rusewesorewexo.pdf
    • https://toskov-yordanov.com/userfiles/file/31640450446.pdf
    • https://locoffice.ru/userfiles/file/xulikazalekamavu.pdf
    • http://keramann.ru/uploads/files/51750919415.pdf
    • https://proartgaleria.hu/files/files/5244328093.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/vixiwowuwerof.pdf
    • https://onwater.my/uploads/file/patepuwaganekolegelulelom.pdf
    • https://xrtradingfeedback.com/cmsimages/file/948270518.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9e135299---nomirudorajoropa.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613802a164622---38863923078.pdf
    • https://barcelonacentromedico.es/files/galeria/files/defijazafoxapinidoxize.pdf
    • http://softtox.com/new/userfiles/file/suvadojefofo.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/31994040940.pdf
    • https://bongkartuantakur.com/contents/files/roxuregadamepejovobipax.pdf
    • https://alakharia.com/public_html/userfiles/file/woxemikasorukewuxofunin.pdf
    • https://felicityokolo.com/file/gotidafogimaxobevomatup.pdf
    • http://morethancars.nl/uploads/edytor/file/80997247811.pdf
    • https://landtop.com/filespath/files/20210910125333.pdf
    • http://hig-hegmann.de/userfiles/file/73648071335.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wear+os+development+tutorial
    • 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_off0000e73d.bin
0c97612b22273aa20f927fe164b40ff7f30b02898452ca185922f7e2d15b740f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16692 bytes
font_01_sfnt_off000112c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16792 bytes
font_02_sfnt_off00012ade.bin
31b45d70f99eacb4db1cc6bcfb141acc5727cdd3e5847323a8adfbaf30fd497a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 10712 bytes

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