Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98f56f9e7bf6ebe…

MALICIOUS

PDF

77.4 KB Created: 2021-10-02 17:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d369865ee4aa24709027fb022cee6026 SHA-1: 6fe00861b67cd61a45eebf3fc8c9210130e1bced SHA-256: b98f56f9e7bf6ebea35443b5a89b82be5daf595e3339e3978c1f9f01cb0cb87c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings point to a malicious link-hosting document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aaas.handyfriendship.com/upload/files/72741852761.pdf In PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/2208390353.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/12352689244.pdfIn PDF document text
    • http://mlight.cz/archiv/file/23924797849.pdfIn PDF document text
    • http://kezheng.net/Upload/file/14420259254.pdfIn PDF document text
    • http://wwstationery.com/files/file/9582022386.pdfIn PDF document text
    • https://iword.de/userfiles/file/65175115725.pdfIn PDF document text
    • https://pellevah.com/upload/files/sowawibagotaxisifivixedeb.pdfIn PDF document text
    • https://arendic.cl/files/27745744680.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rulekaripezokikixajir.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/fumepupet.pdfIn PDF document text
    • http://school15-tyumen.ru/f/27639797627.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/50051942410.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/bagaxubijadezuratafuja.pdfIn PDF document text
    • http://minerva-collection.net/files/files/10223076389.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/84195425944.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/bedawapidalanagazu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/33775542234.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef83856c8---60616246692.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/jejisafavojud.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/ledaluvexafufulabe.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/16710855406.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210926_014731.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/tomiwovuwesuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sift+heads+remasterizedPDF 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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 20588 bytes
SHA-256: eb6d992232243cbae65819b970ed3972fc1ebf618a7f6a96dc5017c260aaf543
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10484 bytes
SHA-256: b03d79299d98a4922730a939ceeff84b60a63e70856ad6d1e222caf4c3f12369
font_02_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1