Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6593432286b16d5…

MALICIOUS

PDF

72.3 KB Created: 2021-01-10 12:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 597a72804e22ff99a101f2924b1ef26e SHA-1: eb3d4827e705a6aefbb3b894175c310ede3f8c87 SHA-256: b6593432286b16d5327eeec8b9d9f654972616e3c9cc4f3f0519c1ce9ee5db41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malware or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=stillness+speaks+pdf+eckhart+tolle PDF link annotation
    • https://site-1166625.mozfiles.com/files/1166625/fighter_hangar_elite_dangerous.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe64f0a0ace1.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/H29jbig/radiology_ltd_wilmot.pdfIn PDF document text
    • https://site-1171523.mozfiles.com/files/1171523/82846092883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_5f9b3f728f1ba.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/XfM0R4b/4300766232.pdfIn PDF document text
    • https://site-1175421.mozfiles.com/files/1175421/ear_doctor_in_ratu_road_ranchi.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/8899720.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/busulabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5fdb052628f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f9bd8e749a01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 5412 bytes
SHA-256: 07f813b7f0f37fc00965858d6f560580409bf4987e32e73b80ffd4984e0515fe
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10280 bytes
SHA-256: 2c9835d784f92b659787e40574de731a27ca3ae1d9213b2592566c960c9b7dd0

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