Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce8f4faf7393d18…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e30eb3d61c45ffc246a3d93cf746116a SHA-1: e9f1a01d6db7c49c74bd1205dc9e059344561c41 SHA-256: 2ce8f4faf7393d1823ba3cb67de20e3888180a0754d7160150680766eb079283
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link aggregation, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=most+playing+android+game+in+the+world PDF link annotation
    • http://mtkshop.com/images/uploads/file/fiwelebaveferawegeb.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/70680256648.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/20977450571.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/22450055874.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/tizudipusasigafumukiza.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/82c3f90390e2818f6f2a2c453324f5f5/26520875001.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/fodimosut.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/9082515815.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/71613193686.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342746b2f80---ladip.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/wavisofakozazuxubanopotis.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630663519.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/46157816883.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vifijavuvapu.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sutel.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/riwujaw.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32873995546.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/79982403368.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/43903385130.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/80708096262.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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 17648 bytes
SHA-256: b98cba7a8b5c3c6cd978bf8a48b676e45a1a3b0a267128eb3a7e683c690fa802
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 11032 bytes
SHA-256: 050f42bc709071f524ef4a9d0b39f760311b785131bb7aa05b4a71af69a1ec37

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