Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc3262453036ac3…

MALICIOUS

PDF

64.7 KB Created: 2021-02-22 04:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1e75820e31a307e62e4c0f503788672a SHA-1: 07379b5e6608b2808adf3f75cd1234022aaefbf0 SHA-256: 7bc3262453036ac32b581d48de520dbd43c0818c09914d31808e40509a628d89
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the presence of numerous external links points towards an attempt to redirect users to potentially 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://druttle.ru/strik?utm_term=el+nuevo+houdini+chapter+5+pdf PDF link annotation
    • https://cdn.sqhk.co/jaxogubajo/ODhj3jc/nebide.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/xaduxifesinepotawij.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/arFhg2y/go_bus_dunedin_contact.pdfIn PDF document text
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/tezesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_6001cdbf8f61a.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/fokapikow/30577591351.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/wekodux.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/renilakaponavefivubo.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/18740299889.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/73782000307.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/wogurokuzesesura.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/73747210574.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/burapofotemilosabo.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_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 5208 bytes
SHA-256: 583e84ca3687219c5f6bc9437e36df47a9a64a0efde33be28f4c378226612d4b
font_01_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 9684 bytes
SHA-256: f53c550f755108fc7a00d39331820ec080180d0b2615d444bb086f52f7d6fdde

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