Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbf39c6ff976fc2…

MALICIOUS

PDF

66.3 KB Created: 2020-11-24 23:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f6ccfa5f1dae89fc7a3d3f17e792a761 SHA-1: 14f635bb9e4553545ec8b1b69934170fbb0824c7 SHA-256: 8dbf39c6ff976fc2f97140712d76ee90666d1abe971ad60310f3f00fb0907036
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/strik?utm_term=personality+characteristics+of+ares PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f9532237974b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8ae6672f4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fb882a132b26.pdfIn PDF document text
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/larekurat-numavokejo-lixulekubufi.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/1552540.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/bupaxomu/jofitezeluk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/plot_and_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fac1e1-8c24-4bde-bdbd-4e60b64ca30e/rulokamabigatun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959c3ff8-47ce-48fa-8efb-2973c954b601/howard_high_school_atlanta_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/westwood_high_school_gillette_wy.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/lenugijaserugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb094b2-6cf8-4a1a-b360-1b5a88bae98f/vewademenagumipuxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc745ab1-e0e7-400e-b417-46b04764e060/42612650433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9071b6d4-265d-4add-a602-b36195ba56cc/babujarokotinufanowafemod.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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 5072 bytes
SHA-256: 216172a6a904a4e2555fb3828c2f1c5e3571b1b6d64ced54d7a142c3ac87fb3a
font_01_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 10296 bytes
SHA-256: 88fc81c16cb754dee6773dfe3ba17d908b7f9a7db26b27f732e5095af6bb5ed2

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