Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8451922eed73dd7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-03 18:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d7da2de7760adf0b29d70aba015f5db6 SHA-1: 6d1303e87f0d7d12f20c0dff02daafa9074646e1 SHA-256: c8451922eed73dd722decba694b3d5d9007364403afe32199411ecc8a5799ef9
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used to create link farms for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://crophysi.ru/award?keyword=the+undoing+season+1+episode+5+review', which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=the+undoing+season+1+episode+5+review In PDF document text
    • https://cdn.sqhk.co/gumakulex/ZhjgidN/34014262719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fdad78789cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_60135e8c23202.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/6781b9443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5fd08289cf3c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ff7ae7ceae8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5ffe6075ce678.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/eCidQaR/30549970673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_5fe80caef0265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5ff5f66903565.pdfIn PDF document text
    • https://cdn.sqhk.co/xikotoxerov/ENjhbgc/30488491015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fc9a32382058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6039c6c243078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fc5db0931839.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/wofeziwoju-zalumuze-naxukof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fcc5a36158b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fce9a9f76c58.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/kozewuposoridil/lean_six_sigma_white_belt_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/2394642179.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/lagu_bump_of_chicken_ray.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/html5_template_code.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_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5464 bytes
SHA-256: 7796fcadb280c3362f06e1944244765b8f873531cc0ba14e69bd85dbd7d3700d
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10684 bytes
SHA-256: ea1522b200b69422ddb08f67b5d7ea76cb88e8e4a48e65d02e9f8f8742f17da3

Open this report in the interactive analyzer, or submit your own file for analysis.