Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d764e9281fcf1f…

MALICIOUS

PDF

81.3 KB Created: 2021-01-11 21:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a05a23fe7b6782881dd208bfa6f2a06d SHA-1: b9419d89c8059f3c0cbf21b3a078ba6854369c70 SHA-256: 61d764e9281fcf1f793286b0ee5cc0276726f8254131596f332c4fb17469f531
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure and heuristics point towards a phishing or link-farming attack vector, likely delivered as a spearphishing attachment.

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=16th+century+italian+peasant+clothing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f9d02ba26113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ffb4e84dd0d5.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/jEsjdjc/43453531980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370273/normal_5febf38b6ea43.pdfIn PDF document text
    • https://site-1180366.mozfiles.com/files/1180366/funny_space_pictures_cartoon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5fa0597cd296f.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/9772686.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavabi/lessons_learned_template_for_project_management.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/vanguard_imaginary_gift_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/42533045576.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/nilisitumalurijo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/command_form_of_ar_verbs_in_spanish.pdfIn 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_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 5408 bytes
SHA-256: 898d9d2a058154fa02839b506170d95965e85045d75e13f2331a45d00760ca73
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11052 bytes
SHA-256: 4a92b77476d3a575b2862c2829c8ae6132a05ddc465778b5858f5f62c26cc57d

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