Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf1931a30a885e…

MALICIOUS

PDF

71.7 KB Created: 2021-04-03 18:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63bd901787ca9a81266615e809a9421f SHA-1: cf62685467f312b62323ff9d6a09d44d118c2a86 SHA-256: fbdf1931a30a885e8b1d07e563fe3f77f1434ff68b8d4a1c9be327517cb243f8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=alto+saxophone+book+1+pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_60613022b0fb5.pdf
    • https://cdn.sqhk.co/tivuzofep/3yhh3MW/vunuvolisikol.pdf
    • https://cdn-cms.f-static.net/uploads/4415929/normal_602b3680aec0a.pdf
    • https://cdn.sqhk.co/rutunidosaw/Bjbhbi4/download_hop_ball_3d_mod.pdf
    • https://sotamepepoj.weebly.com/uploads/1/3/0/8/130874386/suzasulopobuji.pdf
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5ff1f063ea7f7.pdf
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5fdd9bc10f72b.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_605211380e6ec.pdf
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5ff49a66c1fe9.pdf
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fe062ecdc384.pdf
    • https://cdn-cms.f-static.net/uploads/4422640/normal_602e5aac1a255.pdf
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/bazasutavoge.pdf
    • http://gesenimul.22web.org/doboz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bonerewutejipa.rf.gd/2841591209.pdf
    • http://rasiverud.epizy.com/reverse_cash_and_carry_arbitrage.pdf
    • http://donaweraketo.rf.gd/5508264892.pdf
    • http://nerokigonone.rf.gd/87722638738.pdf
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_63df4ef97dcd4840b15f18aaf546c5ea.pdf?index=true
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_0e18c2b9665243ea849f31eefa5631ca.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_off0000da1a.bin
a1e7a8b82e0be3a60e7aa869110c94ee99dbf1879aac62121aa8a7e4973b9aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5344 bytes
font_01_sfnt_off0000ec4d.bin
36b82e08bfe07f309143de8733aa68fd6f468c197cf897ef26d49d4a67adac49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 11036 bytes

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