Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991e88bb99d46f3…

MALICIOUS

PDF

67.2 KB Created: 2020-12-17 01:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ea2f29dec36deef4522637c8a2854c9d SHA-1: b7409498c70c6f79ab8d407337ea36c6cb4b0945 SHA-256: e991e88bb99d46f3e0a7db889797cebdb17b1b725a051b2ce240dba3f07f0f73
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs indicate a high likelihood of this document being used for phishing or distributing further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=gst+full+details+in+english+pdf PDF link annotation
    • https://numiduramar.weebly.com/uploads/1/3/4/5/134595515/wironisiwin-jiset-lipup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_5fda7d3934cd0.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/3978197.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/jifejasapaxibuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fad390bb34b8.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/baxegezivumi/solaguneb.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/astroneer_free_full_version_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/lapaza.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6b625147b148042bbc5a/1606380386813/crazy_busy_peaceful_holy_night_play.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/fuzuxilorusibafof.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/jegunegakenonope.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/lagos.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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 5240 bytes
SHA-256: bf8ab04ddc9c9518f06db6de0832ab29b1cccde3189f92d9173410d72d0616ea
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 10992 bytes
SHA-256: 88f5a4d91b4a54c59da5398faa23d85c7951fe40458751ce1bc14cd2eaec5537

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