Malicious PDF — malware analysis report

Static analysis result for SHA-256 3666aabdb5ccf8d0…

MALICIOUS

PDF

91.0 KB Created: 2021-05-13 06:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc816d2b2b5f1e9e94d3a6d411122d6 SHA-1: b4d38cb539d9399290bac45ac70e509169483888 SHA-256: 3666aabdb5ccf8d079406263e0215d37a7c1f3b27bc852b462f87c07090ea1aa
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading literature, consistent with phishing or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=the+columbia+anthology+of+modern+chinese+literature+pdf+download
    • https://cdn-cms.f-static.net/uploads/4443617/normal_605ae66ee0560.pdf
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fce44cd24b48.pdf
    • https://cdn.sqhk.co/xataruzepape/ibNjbdJ/vabimifetujilo.pdf
    • https://cdn.sqhk.co/dimowitop/heridJr/juveponunafajitefimitage.pdf
    • https://cdn.sqhk.co/bawevabob/hdMhhRw/wilanodozibejinun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b08969fd-2727-4145-8bfa-c82188c30edd/probability_of_a_complement_of_an_event_worksheet_1_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/e946bc46-9787-4570-9f5a-2eab047f439e/la_biblia_hablada_genesis_16.pdf
    • https://uploads.strikinglycdn.com/files/42f3e639-d5fb-4a85-a070-f67535e7d00a/kibowov.pdf
    • https://uploads.strikinglycdn.com/files/cb928986-7152-4815-9946-77c64b368e4a/american_dad_episode_scripts.pdf
    • https://uploads.strikinglycdn.com/files/95166611-0843-4028-84e3-9772ec2b050b/tefijalirobifa.pdf
    • https://s3.amazonaws.com/gazivemon/39432816309.pdf
    • https://uploads.strikinglycdn.com/files/b0868be6-9891-4c81-97ba-4fa4e78c6b8e/28089615016.pdf
    • https://uploads.strikinglycdn.com/files/44243496-2017-4bd7-ab12-1b48f0e5afbb/wekuforome.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/8517872920.pdf
    • https://uploads.strikinglycdn.com/files/cddf1cff-6c2d-4b6e-a108-4c089f739513/1920s_political_cartoons_prohibition.pdf
    • https://uploads.strikinglycdn.com/files/4ab468bd-141c-4b5e-9d3e-312469e1672c/how_much_do_safety_inspectors_make.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf8.bin
7bb6cce0c868b2eb34f2833da7e5772fe310f2c4ef6502e56369379fab835456
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 6800 bytes
font_01_sfnt_off00012323.bin
3e25d3c828664bc5596dd78f11abed24ba40a559cc226d908654ea999b2f7ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 5852 bytes
font_02_sfnt_off000136f8.bin
29177a9df29a23488851ab60462373661aa824eb41ea719dc5991b3618bb6d73
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 11552 bytes