Malicious PDF — malware analysis report

Static analysis result for SHA-256 0711935729f8d855…

MALICIOUS

PDF

68.9 KB Created: 2020-11-14 03:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42d953ce6ecbc5694a40d5142305f948 SHA-1: 768e4d97acd61c4044850e30218ae5088b1d3cb7 SHA-256: 0711935729f8d855eedce3dec85e5483c0c5bc2848e2fb766b4ff60cd3452bb5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafffi.ru/strik?utm_term=symbolic+violence+bourdieu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fa9b17fe5d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fae0c343df9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fa8f459c5eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5f9ba1ebccc01.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/3001432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5fa3df3d6b162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5faed8db17008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f9e2a7c8bb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fa9b925114ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_5fa7dd960b5c8.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/255aca47-28ec-409c-9aa6-bf989728f68d/wofivimadixijizonenaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdd3dc9-07f4-4818-a222-5675363eff20/xibusu.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/18394674679.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/spring_break_worksheets_for_kids.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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 5320 bytes
SHA-256: 91cf509729e960cd99e4bc8bb22c67e8d111a1ff9b6f8fca9e4091e9f007599d
font_01_sfnt_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 11036 bytes
SHA-256: 9ebd046c1112ed8467dde9785536aaf07b50d40bdeba8d326e615b1a041a57a5

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