Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5359979e5c2080…

MALICIOUS

PDF

70.7 KB Created: 2021-01-01 06:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f31497bd3adea86bd3f6eeb2b3e5ab2 SHA-1: b8805c6ac5ba387017aee86c135745b1b0fbf585 SHA-256: 8a5359979e5c20803f2dc8697f6e8a48951166778a213c8c19993eda89abbccb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic, pointing to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=eye+candy+modeling+website PDF link annotation
    • https://cdn.sqhk.co/rifokinimito/ja1hihe/debakomevope.pdfIn PDF document text
    • https://cdn.sqhk.co/sulojumi/dAjjhbS/50668087977.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/jj9qjal/survival_craft_apk_pc.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/9588575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5f8e345541ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fc03391111fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fe79d0480061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fd73566a3228.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/visojagikudewe.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/jhjG6gf/guns_and_glory_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5fb8b9029fb61.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/gx4Zgjh/88470126020.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 5456 bytes
SHA-256: 5b3eda3809355b5955205e9ced7a3e1f5be36401daadc22df78268cf974bf6c2
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10148 bytes
SHA-256: 94d7185e77008880ac93a63a1970b045748c651cceacd63181ad08df18506b8f

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