Malicious PDF — malware analysis report

Static analysis result for SHA-256 24351e4425fa6266…

MALICIOUS

PDF

70.5 KB Created: 2021-05-26 22:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cc9c3265a8b1bd12d5356fb1b9af7c4a SHA-1: b2af9f04a51604225db551e9f3a804a15479729d SHA-256: 24351e4425fa626661aed4886fcad94f3f55c04753825e7ab4dfb446b82445e7
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-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.
  • 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://vilenefex.ru/strik?utm_term=ejercicios+con+verbos+regulares+en+pasado+simple PDF link annotation
    • https://gijudopit.weebly.com/uploads/1/3/5/3/135321477/f5ce49eb6e3f5cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_604db957f23c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fe127d4ca205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5feebf9971f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_605d8ff9da165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_60230385c6172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_604a975ba3950.pdfIn PDF document text
    • https://pusekejewoxabir.weebly.com/uploads/1/3/4/6/134647321/7702834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_606102f287471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6014c805570f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_600e793840a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_60550b0da5be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_601d31b14c871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_60604e0fd6e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fe851ca20f0d.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/sezakupazi_jojudas_ranowojenoda_maberubovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_602da3499fb40.pdfIn PDF document text
    • https://pogerukafitili.weebly.com/uploads/1/3/1/4/131437037/5752a2b.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/34c6bc69-1991-4790-8904-d17f0a42e8cf/how_to_do_rhythmic_breathing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370e8d9e-5ddb-4163-a18b-09903f8886f9/gurovasogonopoxizuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0bad42-ef02-4cdd-bbe6-b540385b8c66/active_and_passive_voice_questions_and_answers_for_competitive_exams.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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 5628 bytes
SHA-256: 9079ec44ac41765d92eb16537895d955f1153112656d89945751c748da1f1379
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 11604 bytes
SHA-256: 0c777cfc9d994bf2fc367fd15ed6b0beb747a2da7280fb02178c01e8c0f04176

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