Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e531dfc17aea604…

MALICIOUS

PDF

77.1 KB Created: 2021-05-27 12:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7c70bd4f0fbfb3acd2944540878d49cd SHA-1: a15ce377aaf0b5f7382af8bad9f637403c028f74 SHA-256: 1e531dfc17aea6045e2bc0085f7c0fba52e4bd266cd756f53fab27aee231c5d0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=simple+origami+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491723/normal_60461eac04cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_6034722a94501.pdfIn PDF document text
    • https://vadezewojig.weebly.com/uploads/1/3/1/3/131379553/fc34d13185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fdaf71e2f2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_603eac0b35938.pdfIn PDF document text
    • https://nivolepefusux.weebly.com/uploads/1/3/4/8/134886615/neteziwobo.pdfIn PDF document text
    • https://basalusorur.weebly.com/uploads/1/3/4/6/134661810/7398548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370267/normal_5ff8fc56617a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60610c183c511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_60065a25e9167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_604d2941b54a5.pdfIn PDF document text
    • https://fepuluji.weebly.com/uploads/1/3/4/8/134871890/5782e55fe448909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_600eca6edf36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_6037c8d6d4c94.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/wubebedewepulop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb1f93b9f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_6033a118b45a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_60107d27e723d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff5ce9b29f78.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/338e3359-d58b-4248-a73b-c32301ea6e50/wolf_oven_cleaning_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a08778-c862-452e-8705-ee7d7607a6cd/29472860615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddab863f-10a9-49fc-b0db-dbdd714634b8/casio_sport_protrek_triple_sensor_strap_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6d459c-08ed-4700-a327-acf5b62cad55/guvapobinujefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a039ace-805e-4ba5-94ec-f2c8e4989d64/canon_mg2200_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39727b40-3019-4cce-aeca-1ed68291daa0/11270129854.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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 5492 bytes
SHA-256: 079a2e71edd38c2e53ad4b0ba58a28bfe8730f3297e780c31c0511bfb6a595a2
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10460 bytes
SHA-256: 338fc28b689b18b85e19beeeaf3420f11938472c826c73ebcd62fee308a515fd