Malicious PDF — malware analysis report

Static analysis result for SHA-256 214257f3aaac064b…

MALICIOUS

PDF

92.5 KB Created: 2021-03-27 19:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b40791363bc28ade2cf40fba9719fc9 SHA-1: 79e1da6c678aafc8fd2c624de788a165272e706c SHA-256: 214257f3aaac064b14b4dd006438cb23369557a883c46a7f9e1250b632e967c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'CLAMAV_DETECTION' heuristics. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=what+is+madame+bovary+about'. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=what+is+madame+bovary+about
    • https://cdn.sqhk.co/nulusezitelo/hdIhejf/39868919519.pdf
    • https://cdn.sqhk.co/lilaxikixo/c8UXdCI/50566760865.pdf
    • http://esmoney.site/ocl2_electron_dot_structurez3ba0.pdf
    • https://cdn-cms.f-static.net/uploads/4459640/normal_604e396122570.pdf
    • https://cdn.sqhk.co/juvanejejuwo/bgA3LJv/logitech_g27_racing_wheel_for_xbox_one.pdf
    • http://pristav.pro/2007_dt466_injector_replacementuuad9.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_604928d03e468.pdf
    • https://cdn.sqhk.co/futevanu/ihwhahj/91347085562.pdf
    • https://cdn-cms.f-static.net/uploads/4487409/normal_6049278e8f392.pdf
    • http://airned.ru/movie_songs_ringtones_for_android_phonespiohg.pdf
    • https://cdn.sqhk.co/legusovej/ATl6hgA/82636191540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_eeeb5e916d2546b5b2f35ac8ccf030ea.pdf?index=true
    • https://s3.amazonaws.com/jeromopelurab/trumpet_solo_jazz.pdf
    • https://s3.amazonaws.com/dezajok/50452182761.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/papolewuzajebowed.pdf
    • https://s3.amazonaws.com/salade/kojekaxege.pdf
    • https://s3.amazonaws.com/wowonesoribu/ayn_rand_capitalism_the_unknown_ideal.pdf
    • https://s3.amazonaws.com/pilazi/warriors_book_series_1.pdf
    • https://s3.amazonaws.com/tenunud/whatsapp_plus_ultima_version_apk.pdf
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_f001c16675ca41eeb64a34d8d61df36d.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012679.bin
2010787ae07244584717934fd236fcfee5655b5fca4ade2852540a6e7b9415f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 5348 bytes
font_01_sfnt_off00013888.bin
99949fe5c724bcc09c56d87ae8ff12f548ec16f8bb08e8917411ca9c7dd87baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13888 13300 bytes

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