Malicious PDF — malware analysis report

Static analysis result for SHA-256 733819a259ac9043…

MALICIOUS

PDF

101.7 KB Created: 2021-03-20 15:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c655c2ea67223f20c51ce0ea510875d2 SHA-1: 235c409f03ce1ec525f6b448d6c8b178412e269f SHA-256: 733819a259ac904325cd3ac0859257100069a6e27bf60acb1a1c0e03584831a2
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to awards or academic documents, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/award?keyword=anencefalia+pdf+scielo
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5fd9c88e0ac75.pdf
    • http://parhelifrl.space/global_citizenship_definitionom311.pdf
    • http://tesocoin.online/40886514522ds9d3.pdf
    • https://cdn.sqhk.co/tigixexaxi/VSfJwjb/chinese_historical_war_movies_2017_with_english_subtitles.pdf
    • http://fakts.design/dizupitefivetaruvuraluke6x3d8.pdf
    • http://copyright-security-ig.com/girlfriends_guide_to_divorce_phoebe_styleuvx5q.pdf
    • http://itverys.space/is_double_dating_goodcrrwm.pdf
    • https://static.s123-cdn-static.com/uploads/4426688/normal_5fdd786870420.pdf
    • http://abreudesigns.com/157571993382q2on.pdf
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fcce9663020f.pdf
    • https://cdn-cms.f-static.net/uploads/4410194/normal_60119a8198956.pdf
    • http://edalovert.xyz/kujadesi8et1a.pdf
    • https://cdn-cms.f-static.net/uploads/4473384/normal_60411eae7c659.pdf
    • https://cdn.sqhk.co/vefutifeves/yDgevNU/87210454386.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xixepobubin.epizy.com/wanuluwen.pdf
    • http://magepatozof.epizy.com/kuvirototogujab.pdf
    • http://fegifujeviba.epizy.com/puloxuzojivorekarababu.pdf
    • http://sajorasuxanuvil.epizy.com/capacitors_in_series_and_parallel_examples.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ec0.bin
553224af3ef00aefb90ffc51d62e42e4269b61dc90d491d4c963b8c4a2b50a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 5040 bytes
font_01_sfnt_off00016002.bin
d236e1d01e0ed349bf5298c69ea8f3840e1c75d79d8c52eab9c7d4b56c8ee340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16002 13344 bytes

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