Malicious PDF — malware analysis report

Static analysis result for SHA-256 9609031e4723d10c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f01c3742eea6740fd67012c3a90f5e8 SHA-1: bdb0485bdc90d92790910a835bdc98b6f0bf7279 SHA-256: 9609031e4723d10c195c9e79e349b1777dd67fb5d1f22cae26731805ed989ee8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=free+app+for+live+cricket
    • http://propertiesforrent.com/userfiles/file///sikumuxumetigoxabudu.pdf
    • https://soosekszer.hu/upload/files/68941507339.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/34065837995.pdf
    • http://laptopcuhaiphong.vn/upload/files/ruwofome.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/latilafavagukijo.pdf
    • http://studiofelician.com/userfiles/files/24269326724.pdf
    • http://gyogytornasziget.hu/uploads/files/99130103147.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/81752078744.pdf
    • http://gildiamasterov.ru/userfiles/file/64341733793.pdf
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/bisazazagawigarimo.pdf
    • http://adance0112.com/upfile/editor/file/76708384280.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/89656595231.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/10522271610.pdf
    • http://elitvorota.ru/f/file/8284319870.pdf
    • https://12shio3.com/contents/files/jisagulakefubuj.pdf
    • http://www.pvvc.cz/files/37841116063.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021924213169530.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/koxelegimitogawewolude.pdf
    • http://abc-tel.ru/data/File/mosofusefefedagujuxadet.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd51063bc---kabozefikog.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143269f00c6d---9307080127.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/27548794191.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/9646017520.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/53756878984.pdf
    • http://studiotipaldo.com/userfiles/files/vewunowujizuguf.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_off0000b0aa.bin
e6168011e9e9993a7c4ddf88477d4026f74b5a4022d81567e5c0aa518adf2d24
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 16192 bytes
font_01_sfnt_off0000d950.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
font_02_sfnt_off0000f167.bin
7e37d008ac4881a9bcb7b6f7dbc411f3dc0c6c546f19b023df63161256f766fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10336 bytes