Malicious PDF — malware analysis report

Static analysis result for SHA-256 01664805adc7c5e6…

MALICIOUS

PDF

75.8 KB Created: 2021-02-10 06:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399b27f0362e8f054d4f4fc92d73215d SHA-1: 1314da94278edefa8f3a70c8da77071390358a05 SHA-256: 01664805adc7c5e69e0976f594585116839208e1fed8b178c992c8d054df3fd5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on multiple domains. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=adblock%20plus%20android%204pda
    • https://cdn.sqhk.co/molavagew/VDjdjdJ/zoburuzuturawapo.pdf
    • http://puxomisolerejog.iblogger.org/tracing_numbers_1-_10_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_600a4c6e7c50f.pdf
    • https://cdn.sqhk.co/kewawukufiju/ZKwidS2/fairy_party_decorations_melbourne.pdf
    • https://static.s123-cdn-static.com/uploads/4469863/normal_6001e1a40d4bf.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601359791b5b6.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d4b46d731.pdf
    • https://cdn.sqhk.co/jesupasuzoku/jikmggD/cake_design_simple_ideas.pdf
    • https://cdn.sqhk.co/wiwuwigo/Hjbjesp/not_scary_halloween_costumes_for_kids-_girls.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/da58515.pdf
    • http://copytoshka.ru/volume_of_rectangular_prism_worksheet_free3r64d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000df70.bin
70ac7bab780ae43dd940e6dac6f31aada5328885008046dbc4f2140c09a3e8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 5348 bytes
font_01_sfnt_off0000f1ae.bin
97027ae376f3d628406c4b9bcd2b38addc7cf083e79793d27263fa763a9154e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 15320 bytes

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