Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28a970e1a8be8e…

MALICIOUS

PDF

68.2 KB Created: 2020-11-18 22:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1954cf96cb14936eed84b6b13053b36 SHA-1: d283ed2f662715c35a7dd151e920768cac5f0557 SHA-256: ef28a970e1a8be8ef5b8a8f6fa0335ad20c6d3b0eeeb794728dd0196c31dcb14
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'https://trafficel.ru/strik?utm_term=simon+paul+marsh+qui+est+suits'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious websites, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=simon+paul+marsh+qui+est+suits
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8c95e3837df.pdf
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fa0e6e6c3daf.pdf
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f98b08bb4012.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8765c98aaa0.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fb4d11cd66bd.pdf
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/dukaxonizawoki.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/412102.pdf
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5fa11178d8697.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/2244901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulozor/68906247707.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/alta_via_2_dolomiti.pdf
    • https://s3.amazonaws.com/kasuwevovog/suzokafetaz.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_off0000ceae.bin
f9d6f4f7317365048d0c06c74fcf24f50dc346fe5a03f8de471e4c29de357c83
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 5288 bytes
font_01_sfnt_off0000e077.bin
bcbddc89598353033c69605fbca8647f859d476683b4a3726e66de1fb626a937
pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10596 bytes