Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e814a0ee2d8316…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 09:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28281aa9caa5985dcdfeffee692c0449 SHA-1: 893aa2abd11685f93b8f9f5493a473246d326e28 SHA-256: c4e814a0ee2d8316ea40a40f8b9da20a3b435abb8f3878d6f0a1ef36a6135a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The ClamAV detection confirms this assessment, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=iphone+11+pro+price+in+bangladesh+2020 PDF link annotation
    • http://mikol-styl.cz/userfiles/file/35753019557.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/86238953995.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/58e521d3ec280960f68077b67bc0a882/77900135909.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/29555760758.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/80943180368.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pujarenud.pdfIn PDF document text
    • http://w-mill.jp/images/file/varabivexi.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/totej.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xegavuzipeliwijo.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/3795698.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/diwewixexese.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/70378441521.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/81518405459.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16335665742.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/witodoliridunamenum.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613988d56bece---gujaxiboxeruk.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/dekaruferodus.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/65146146723.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32834819220.pdfIn PDF document text
    • http://unibox.lv/files/text/39465911824.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6865278941.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/87769126303.pdfIn PDF document text
    • http://goldia.cz/data/file/netakurunuvaxosipadof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 11080 bytes
SHA-256: 6620dd09ca9f8255ac501847aa91a4e55d8f796e312e2ac3f3ee8a3841ba2e60
font_01_sfnt_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 16352 bytes
SHA-256: e069cf24c56b8649cf4f6c2bb53baca4b7b2f6d095fb4f5230f2eddf539dd199
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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