Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0ab8c9fed3b15d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 20:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdb1d758b6aec0ae4fe8d1d9ea017d9d SHA-1: 683b853ec51f94f22dbddb67b035bef59bfe7051 SHA-256: ff0ab8c9fed3b15d56a4ceee3f08489200cba7e3eba18c5ceeb47cbdabb303a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kvarkeno56.ru/userfiles/file/jolewa.pdf In PDF document text
    • https://mashura.co/userfiles/files/tipofuju.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/28493671044.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c2af81db1a95c9d1166d8b9397d80410/tikomelowotevadibaz.pdfIn PDF document text
    • https://baglab.pl/galeria/file/nejaro.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/99076916925.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/14011846270.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/24039563173.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/kedozezogeloban.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/20944451182.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210912173414332712f6zk8x.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/ruxafavidabija.pdfIn PDF document text
    • http://101balkon.ru/upload/files/80598077856.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/82204678492.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/10597716918.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/79607408734.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tijogamamejezaje.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/28009767124.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/37984039304.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+ver+videos+en+la+tv+desde+mi+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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 19076 bytes
SHA-256: 71160ffd967a86f45300b26e7af78ba779eb57ae5b7904ee1854c8d236f67930
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 10504 bytes
SHA-256: bc4ffc06359e43ad2915623bc5eb849b46269fe20175352b023423f9d1831336

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