Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ced904869d42047…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 19:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54bad1f395962cb1cc41ee828de19aba SHA-1: acf9170b9ce1deb594550c5433e121066d26b265 SHA-256: 7ced904869d420477ad5f33d028762f8ed01582289c2d2d3c908417a2049b2ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to direct users to potentially malicious or phishing websites. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://matrix-corporation.com/upfiles/editor/files/41825448566.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/tazabetojanudinafol.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210916_000207.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/97582026211.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/81208202503.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wirofujunarusibak.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97562442573.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/28896542471.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/n0i0mii2fju8mrmccg93hboj44/46035736869.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bb236500e8be0da5fb7836be1be3a2b2/36073431294.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/13951750281.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090500280373499.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/65903305430.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/98468942006.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/nufarazup.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/28369536625.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911003049_iofa4o.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/66400908490.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/43172740985.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/77085056738.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/39958952963.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/59269705951.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/deliturapeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=modo+tty+androidPDF link annotation
    • 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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 19876 bytes
SHA-256: 02a01405672b9a44d4c8aebd0798b7b75c042a6f01ae956458170b80baecc5b2
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10000 bytes
SHA-256: 81b18d1ba0f5344383ed5f2e813f8d9b66927312fc0a51c83314a4ac32cc8c8d
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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