Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bf9cf40c6b1db5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87a74be092e9095c23d206d968a4a60d SHA-1: e16670685770558be29bbf503d6e6814a844555d SHA-256: c3bf9cf40c6b1db52ffc3400533037043017ebe3d11f30a7d803410649d3033c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, indicating a likely phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF acts as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=call+of+cthulhu+rpg+7th+edition+pdf+free PDF link annotation
    • http://impex-italia.it/userfiles/files/fimaguzonotodedetupe.pdfIn PDF document text
    • http://epicridesnepal.com/files/fododuveterivolibixalike.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pr8lkm9qj1voe3p5jeegkk9cpu/42074836010.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/89944789291.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/31385468782.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kunafufeso.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/15137194562.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/77777053805.pdfIn PDF document text
    • https://12shio1.com/contents/files/ruxivuxeku.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/86992820522.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/12889331560.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/46061563947.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/80230852345.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/94438486665.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rimupebodusilufizu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/bigasogeraxorewasoxoso.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/20910461221.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/vogesewuvolomotafata.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7220679f---futamejafepewibare.pdfIn PDF document text
    • http://ipceurope.be/assets/file/ragasekeguviru.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/68293429583.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/59242421683.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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 19136 bytes
SHA-256: 4db3573c4019c29921008ccb4f0a38038c4f186f975a1a59f1b328fe12ae02fc
font_01_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 10912 bytes
SHA-256: a5be4ededddaa0e4b46fb0b8b5f68a90f045bdc4dd6f9f61a20f28a06617cbb6
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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