Malicious PDF — malware analysis report

Static analysis result for SHA-256 89836c4f5792da90…

MALICIOUS

PDF

70.0 KB Created: 2020-11-23 21:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4503128a6f1f0c3323af8f4dbf83684 SHA-1: 1c01bd7fc37612f27eee742126d3f177022a7fa4 SHA-256: 89836c4f5792da905da1ff5019baedc20ac078a72ccab9407a5f02a40ca3053f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to suspicious domains, likely serving as lures for further malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=%2525E5%2525BE%252590%2525E4%2525B8%2525AD%2525E7%2525BA%2525A6+%2525E4%2525B8%2525AD%2525E5%25259B%2525BD%2525E8%2525BF%252591%2525E4%2525BB%2525A3%2525E5%25258F%2525B2+epub
    • https://sigozebuxofiko.weebly.com/uploads/1/3/4/3/134372047/wepug.pdf
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f93dc9568240.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/monoviligag.pdf
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fa2a878aee01.pdf
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/ec79602.pdf
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fa3af134126d.pdf
    • https://cdn-cms.f-static.net/uploads/4454825/normal_5faaecdc7b506.pdf
    • https://cdn-cms.f-static.net/uploads/4426571/normal_5fad5a907bcf9.pdf
    • https://cdn-cms.f-static.net/uploads/4460266/normal_5fa9ddc5a4d5a.pdf
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fa17ce176bc6.pdf
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f927419263f1.pdf
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5fa030af43187.pdf
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/setowajum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/besafefaf/zukajivumaxemut.pdf
    • https://s3.amazonaws.com/wilugugo/metso_jaw_crusher.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_off0000c6d4.bin
1d30747efa085d9565e97a8dc8a29fcd8e45f0db862e5ed4579bcce4b6ae2405
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 4664 bytes
font_01_sfnt_off0000d6f7.bin
96967628de49351eedc163250c03072bc2892cce0b00c91594d4e035393e6caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 4340 bytes
font_02_sfnt_off0000e5c8.bin
26f58b4f61405a31fde4260a961abecef4e52f6fa3d588943f9f56b9b5e58df6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 10500 bytes