Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f2aca0780cd350…

MALICIOUS

PDF

61.0 KB Created: 2020-11-25 00:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6781c61e173cd02a0e6b5c27ad20ba09 SHA-1: de0bdc83699fb13541587cec603354eed1d24d09 SHA-256: 20f2aca0780cd350b44744cde4508dfecc57a923cd3d7d49628169f0f8b7f4e4
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 0.9996

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://trafffi.ru/strik?utm_term=shocking+grasp+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f89aee0d32ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_5f9f67f861533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f8ef6c01323d.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/rawobusejo.pdfIn PDF document text
    • https://vefaruturibil.weebly.com/uploads/1/3/4/5/134525254/8713182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5f96feac2aabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fbd8cba8c986.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/8a4516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_5fab2d184969e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_5fa0990ee2970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05329c85-a3d7-42cb-926c-7b5aeefc1aa5/tv_shows_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a25848-f5a2-4acd-bfa7-fc2035221e87/manual_typography_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10e96d4-786e-43eb-bbba-9dcc8277dffb/gatubotizipitawidav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848867fb-fff2-417d-a9b8-ab1ee75c3828/68017254088.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 5552 bytes
SHA-256: 0a41fda681fe3229b24ee8227322f377a99e214349970030d35a6709f6569f70
font_01_sfnt_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 10360 bytes
SHA-256: fc0f10ac0a5ff8c2f772193d10178f38875b92ee6720d9d9361efd78b1a3ca4a

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