Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b60a197bddf362…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 11:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f67369ff772754365307fa7d767d636b SHA-1: 59bd16345f3ac29b57666b6334a947a9beb4d509 SHA-256: 18b60a197bddf3625521fe94275d59b4d30a54058e0c9177a60f12f776a0b892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports the idea that the PDF is designed to redirect users to various external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://canadianrockies.ca/files/file/tabapapetibeve.pdf
    • https://xeroxexpres.cz/userfiles/file/58201948840.pdf
    • https://theelementrama9.com/userfiles/files/guterufajejaxa.pdf
    • http://n3ss.ro/ckfinder/userfiles/files/86484547956.pdf
    • http://mnarch.it/userfiles/files/rerolofapiwitof.pdf
    • http://saothienemb.com/uploads/images/files/74381424156.pdf
    • http://aeusjtu.pretty-match.com/upload/files/xefopepid.pdf
    • https://dichvuketoansg.com/luutru/files/sivarabigitaxonutilen.pdf
    • http://papinchess.ru/userfiles/file/papibifogu.pdf
    • http://bociany.sk/media/file/bowejadoturifugivogal.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/04807ff27885e7adb60a6761dd9cf8f6/poviwajiwonoku.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/41b838e93a880b1ae6fa72be30531170/38149536679.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210921_5CF32EF9AC43BA86.pdf
    • http://heryeryesil.com/resimlerfiles/69009676907.pdf
    • http://yongchengtech.com/uploads/files/202109090625424959.pdf
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/71191985977.pdf
    • http://domadoma.cz/userfiles/file/diviwegeli.pdf
    • http://torremaggiore.sitmap.it/files/files/52138612087.pdf
    • http://biogenetec.tw/image/files/20210912_140649.pdf
    • http://355353.ru/userfiles/file/muruxal.pdf
    • http://baozhaopharma.com/upload/files/36996237367.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/nobijezugawijevufizivake.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/ragobajexusezubupidufe.pdf
    • https://xrtradingfeedback.com/cmsimages/file/92180340181.pdf
    • http://laserbeautymachine.net/d/files/tivewixad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=climate+change+facts+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_off0000b2d1.bin
c88f7694a70ed0a449d7424fd86ba0b103033e53c80992ce538567b9314ed9b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 15052 bytes
font_01_sfnt_off0000d885.bin
926b7d34d86a87e9ad6ddf9749e5027fd62153a3805bbc8e83e832dd29372cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 10876 bytes
font_02_sfnt_off0000f141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes

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