Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3f2e1faacf7850…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 13:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05462ad2b78f6839bd3d3c3e50b914e7 SHA-1: 8404ffc12f90810c88e44a8522f11e2f1f23c9bb SHA-256: fd3f2e1faacf7850e196c9f5bddaddde851570d408153a2194a3f81ade9929bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=notability+android+apk PDF link annotation
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pogusazowo.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210906171032_1446183763.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xeguxavoxavadoruwubek.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vejibaderisaju.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ramuzikagemazejinod.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/68177570409.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/58387918486.pdfIn PDF document text
    • http://caythuocnam.org/images/files/janedivufowiwowijodenedop.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/80192062001.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/99121418912.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jejujozekijajatofad.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/lomebolisivekob.pdfIn PDF document text
    • http://toonesk.com/upload/xidaf.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jivuj.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/38140397380.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021981925366377.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/gewavis.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-19-13-46-djIWlAme.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rexotigikoreroburoloj.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/76755739474.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/taxef.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210906121847.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/nenizegawelojex.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jiposonivapibigazobevega.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_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10408 bytes
SHA-256: f762934f2cd8c857eb78e3cf53aed42fd0464b3173c714e3bfba1fab07283a7d
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 17952 bytes
SHA-256: 2f97688852e498b0681a17dd5074d54127da19060ae1e8eb20c8263aebc6fdc3

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