Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06634978bf03591…

MALICIOUS

PDF

116.0 KB Created: 2021-01-17 01:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e4533db38092b0d04d1e5a6b9324580b SHA-1: 80773d8eba507aa50ea611192050b2e6ce4e54cc SHA-256: e06634978bf03591254c35200fa03a28a9ffc648768ca77fe2aac049375a23b9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One URL is identified as a known malicious redirector. The ClamAV detection and ML classifier also indicate maliciousness, likely related to phishing or trojan activity. No scripts were extracted, but the presence of numerous links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=ruby+for+loop+hash In PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/zilax-pojimexuvite-zozolawituz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fc5d1582e005.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/jajodejokagosenemag.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/gimelalapuga.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/lopijejojunenemevujo.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/8Bcz8LG/xemunedav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5fe4f468cc4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f947dc8e2760.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/ehg1ifz/rebudekikopuvaxuzafofapu.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/fedufiporara/donald_barthelme_sixty_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/xalujod.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/answers_to_ama_defensive_driving_course.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/80421614157.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/lyndhurst_ohio_police_department_accident_reports.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_off000188e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E2 5236 bytes
SHA-256: 67f21d05bac7eddae57f3242675ff2c3ed85712467c55dedd19d6f74697f3c80
font_01_sfnt_off00019ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB5 12480 bytes
SHA-256: 557641bf7422dff9a9c77c30874fba475088428d92dabd5aafc20341d00cfa4d

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