Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9eca4b1280f521…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 16:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cc8bf974c22b4ccb53ea0b68d881629d SHA-1: 53b6651754a28e130cc8489ebe6f59b420be960b SHA-256: 7a9eca4b1280f521fb4788aca9b9d0fb6aa0859ae3f44fd0ca67e01c940e67d1
156 Risk Score

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 0.9998

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://soxebez.ru/strik?utm_term=complex+numbers+worksheet+with+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419836/normal_60246b3ee2f76.pdfIn PDF document text
    • http://ulekschool.online/karthun_lands_of_conflict_downloadsq5uf.pdfIn PDF document text
    • http://pemowovamig.iblogger.org/gejevododizebutide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff76fc73eb1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff03d1122127.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/7561053.pdfIn PDF document text
    • http://marketeuro.pro/xesepemarijq2wlr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6013a5f114d69.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/luworizesupox/98395398770.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/fibidegevixatoba.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/28110730773.pdfIn PDF document text
    • http://xefujexomige.epizy.com/wuzikekixowirizamer.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/defevilun.pdfIn PDF document text
    • http://guzaxugevogifu.epizy.com/sotab.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5652 bytes
SHA-256: 6051fe11d52e7480d160360815ade79a3a7a9fba352352bfdc5197c58e378b4e
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 11140 bytes
SHA-256: 6eacb0afa362299a7de796bdf4406aff6bb2f1b342221ce8123a00230a836cc1