Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ce13248162fc37…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 11:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 021af6b5acf38f3b04348256e9b6a71c SHA-1: d98c495873f66567b23de2ad5e2de9a830d64dce SHA-256: 93ce13248162fc377a6f742c2caa71df3eea6883701d3f66dacca24fa52b0996
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to a phishing or malware distribution site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2f685f811f4ce44b6062a9f248e537e7/82257964140.pdf
    • http://daltan.hu/userfiles/file/63616464262.pdf
    • https://hoatuoi360.vn/uploads/files/97867802622.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/40167842637.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61692393455.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/ditagewu.pdf
    • https://hotellemaritime.com/hotel/upload/files/68358735825.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/doraluferitobis.pdf
    • http://auswallendorf.de/userfiles/file/70097351669.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/56244708160.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/67005295315.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/81963251599.pdf
    • http://www.santamyoga.be/images/file/91350633026.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/vukikedevitobin.pdf
    • https://appchecar.com/ckfinder/userfiles/files/tixapatoridefovedafun.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/sozudaxolitupanerejib.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/98953921741.pdf
    • https://newoptic.sas-global.mn/uploads/files/ponitidavob.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1959453be83f02b46f365bf1354878e8/28911064547.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/89844931403.pdf
    • https://promobryansk.ru/userfiles/files/lagegukugovidixamu.pdf
    • https://vatlieutaphu.com/upload/files/puwinib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=synapse+free+download
    • 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_off0000b148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 16792 bytes
font_01_sfnt_off0000c95f.bin
56d28177f5c34505e023f57c8d038aea2677491efa72001fa9d7183a8f18b320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 10576 bytes
font_02_sfnt_off0000e1b2.bin
d712f7f5015f1dc8cf0507fc6461bd1cc1c2dd2522d96ffc6275160c9fc9aa99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 17640 bytes

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