Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40cfc6312d46cea…

MALICIOUS

PDF

77.5 KB Created: 2020-11-24 06:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3b472cfa24e75439e6190dfd21c19f03 SHA-1: 6637292af5dcbb57a43b78039a5d1f48dffccd17 SHA-256: b40cfc6312d46cea4b20b9e1eb0242dadc3a8be4dee26966308d93e0bea49c64
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content or further malicious sites.

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://trafficel.ru/strik?utm_term=caracteristicas+de+una+modelo+profesional PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5faafce893d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fb31e31a83cc.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/tutejunewop-mipamizexabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f9b929673cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f9599a76ab80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_5fa51d4cb6828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5fa426fcc7863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fa7dc5f0c286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fa3a97c32ec3.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/763ad020-0e09-4459-a22d-b745525670a4/bufumalozesuwunofit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfb97c9-6fee-45cc-8621-d15b243d56e2/90843385373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828b59ff-c00a-4fdb-9485-e61ca706a712/bogaxosadotusasop.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5208 bytes
SHA-256: bf5c0d249d65261a11f596c7ec1ffe018f40e0d57ca3032558969d4dae58aef8
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 12176 bytes
SHA-256: 9fdea65f9e86a647ffce76a0c9a95b55f3f76ca86270cbff466c2fed6c395800

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