Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f81969d9cafb2f7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 21:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fead2b5765df94aa0bdcd65141db3f1 SHA-1: 965a8dc3b78e98302093a29d49282234822f1a44 SHA-256: 1f81969d9cafb2f73cd6b90b025f88cd731d916701dbe97bf214c79fc7834df8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=web+browser+beta+pro+fastest
    • https://vayamcs.com/content_files/files/teperofavejonipejakosuda.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819b39bd63---46816071085.pdf
    • http://productinfo.in/konadnew/userfiles/file/suwazukuvaxosukew.pdf
    • https://usssecuritate.ro/userfiles/file/25806786076.pdf
    • http://automsystem.com/UploadFile/file/20210914091004188.pdf
    • http://charolais-hessen.de/write/userfiles/file/89340482669.pdf
    • http://originalcheck.it/public/img_admin/file///litol.pdf
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/67635696378.pdf
    • http://wefocusdesign.com/upload/files/48309318025.pdf
    • http://dieukhactransam.com/uploads/files/24477275113.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/17744573069.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/22592228347.pdf
    • http://haithuanphat.com/uploads/files/pilodumam.pdf
    • http://alanaf.ru/userfiles/files/81948238495.pdf
    • http://noospc.ru/SITE/files/editor/file/fejuzepixi.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tixigesiripa.pdf
    • https://netlandschool.cl/files/18686159269.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/ratusujojopakoke.pdf
    • http://ekonopuntos.com/campannas/file/vefurasasiwevaxu.pdf
    • http://soluzionebenessere.eu/userfiles/files/4447566761.pdf
    • http://1night2day.com/ckupload/files/667726487.pdf
    • http://mercuresamuichaweng.com/admin/file/wafuwav.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vuvaretorula.pdf
    • http://xn--80aamwn.xn--p1ai/userfiles/file/67003214876.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631001750.pdf
    • https://techielingo.com/fck_uploads/files/89982152110.pdf
    • http://mikol-styl.cz/userfiles/file/xajipora.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_off0000e1e0.bin
f1ce8c8a2dfad89cf3f68bb492459b6dac36ea0bf7a80853d036d08ba37b36e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 10328 bytes
font_01_sfnt_off0000f931.bin
c414fa5e4b4a09c74c3707688c64270a9ad256c81122136a33127b0d11726ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 18468 bytes
font_02_sfnt_off00012907.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 16792 bytes

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