Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7589b93a10f524…

MALICIOUS

PDF

68.3 KB Created: 2020-11-23 04:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 864e31d94601ba8bafb157d7575008ce SHA-1: ee8f13995fea8ec5abaa9f3978a1fb8f489445d0 SHA-256: 3e7589b93a10f5245625de37e94dd7b522c31dd40b38724b287510cd226b4a42
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on link farms, suggesting a phishing or SEO poisoning campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the extensive link farm and phishing pretext are strong indicators of 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-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://trafffe.ru/123?utm_term=zone+6+police+station
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fa188734ea18.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/loxutasevi.pdf
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/moram.pdf
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fb8d22411b57.pdf
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/f0d77eb1289a.pdf
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/zaxuguxenop.pdf
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/2856383.pdf
    • https://bigevuma.weebly.com/uploads/1/3/4/8/134899145/50c4f75e0e4f6.pdf
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5f962128b83ca.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fb8d572b1fa8.pdf
    • https://mijibetifud.weebly.com/uploads/1/3/4/6/134653630/9b788b2a54d108.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5f9dc63535e98.pdf
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fab305802691.pdf
    • https://gepinizidewepi.weebly.com/uploads/1/3/4/3/134305752/guligenaxix.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_off0000d06b.bin
fb4bda238ab9b9eb186cc62339ad0caa29e8f594b0472fddfd959ee8e4abe789
pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 4944 bytes
font_01_sfnt_off0000e152.bin
a2029251bf5ddcfcd99303cc57b144031952f07edda83e5753eea4f6b9db8a84
pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 10372 bytes