Malicious PDF — malware analysis report

Static analysis result for SHA-256 50187361a236e83b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 08:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 597aa7ffb4e724122c3490a68db02122 SHA-1: 424a2aa464bb434e1b23e85725790b86e5c6b810 SHA-256: 50187361a236e83ba2d4ef719a3bc776a7b9e62d1c0f5efdc7b5ae99192518d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=www+movieminions+cc+english+tv+shows+index+of+supernatural
    • https://am-system.eu/ckfinder/userfiles/files/55086171782.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210915_B092077EAE60238D.pdf
    • http://dongamold.com/fckeditor/upload_files/file/givomafosuzusupofileko.pdf
    • http://unitec-egypt.net/userfiles/file/22299159446.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89481d46b---1993894152.pdf
    • https://ctners.com/ckfinder/userfiles/files/47050925018.pdf
    • http://sitoad.com/bbqjoekey/files/202109201157318421.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/20507496112.pdf
    • http://labsshop.com/d/files/88453604524.pdf
    • https://calienglish.com/ckfinder/images_store/files/bogidodibitukifawekad.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/428820855.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/1596111902.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/55881773727.pdf
    • http://tfforming.ru/d/files/80398631508.pdf
    • http://pwmtqatar.net/userfiles/file/melodaxuxetanax.pdf
    • http://bioaec.com/userfiles/files/55628565199.pdf
    • https://qatarsecurityservices.com/public_html/userfiles/file/ginipanatexapopowevi.pdf
    • http://aeon-dev.com/uploads/files/202109100610351287.pdf
    • http://mfcpavpos.ru/file/godakuladamepisel.pdf
    • http://asr-net.ru/uploads/files/19646415531.pdf
    • http://hoaisonland.vn/upload/files/podoxifiguxa.pdf
    • https://xeroxexpres.cz/userfiles/file/14522682164.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 16792 bytes
font_01_sfnt_off0000ce67.bin
f257989ac177907634d97e48fc00c828d6534a051c2095fd74c8be5cc6430e74
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 11412 bytes
font_02_sfnt_off0000e8fa.bin
6a267a6a63a7bff736f1a44a280ebedc749eccaf64b39e7f7dcfc7993c86abda
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 15696 bytes