Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b46e28ef81ab0d6…

MALICIOUS

PDF

77.5 KB Created: 2021-02-17 22:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4792a6a3f710c3ee7c8baff295d33e93 SHA-1: 104c6c29d71425422a18e2ec1f89d852aa4cc159 SHA-256: 0b46e28ef81ab0d62b9b688bf6a5be96bc0f129bc51c58259af4af2675ccb6be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to drive traffic to potentially malicious sites. The primary URL, 'https://druttle.ru/wix?keyword=death+rattle+dc+comics', appears to be part of this scheme. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=death+rattle+dc+comics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460688/normal_601e48c10e7e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fe98565a8048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_600bd3bcbfde7.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/nibameb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_5fe8488ce3f55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b3ca10729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5fecf865e1711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fcd10146171d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_601fe514cd526.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5fffe0d7a1d2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fff3ac36b049.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/gdBibid/best_cheap_voice_recorder_for_singing_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503387/normal_600880053cfbb.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/biwuwukesazef/plagiarism_test_indiana_university_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/arvixe_email_settings_android.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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5180 bytes
SHA-256: 1c0daffbb990287e063f54f0a288a6bc2d9ac13e469567b6654bb45e1b626fa7
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 10736 bytes
SHA-256: 38f416c4fe92c529e0a101f84da3ab35ff4322d516e5cca463d84386a855b7ef

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