Malicious PDF — malware analysis report

Static analysis result for SHA-256 959e9735d38242de…

MALICIOUS

PDF

67.4 KB Created: 2021-05-27 15:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b7a6579836c3118ef74263ba553efb5f SHA-1: b1844a7ea8d584dc9f18b22570c521ebe0936e02 SHA-256: 959e9735d38242debeea26c73c4483370c7a8f54baf4295e7a770ff7a206faf7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to disposable hosting sites, likely for SEO manipulation or phishing. The document body contains garbled text and metadata, suggesting it is not intended for direct user consumption but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=rossi+interarms+serial+numbers PDF link annotation
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/mimeziguwo-xegile-giweninuto.pdfIn PDF document text
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/redakekozapat.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/rexirujidotileniz.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/rotowonuw.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/topakej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_60585e49912f5.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/tozade_ravip_pimex_kesevabavoremep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_60500f3954cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd69e4dde56d.pdfIn PDF document text
    • https://lubukapilibuvi.weebly.com/uploads/1/3/4/0/134095968/luvuzodiwem.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/7018930.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/12b8e.pdfIn PDF document text
    • https://tumafikajenama.weebly.com/uploads/1/3/5/3/135326798/a3f3114b5f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_601007e5322b5.pdfIn PDF document text
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/pijobobeku_gotas_kafukugatojawiw_rivelof.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/6680009.pdfIn PDF document text
    • https://zudafafaji.weebly.com/uploads/1/3/4/5/134508934/mojoj.pdfIn PDF document text
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/2773150.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/9680504.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/notoxifojovevurokod.pdfIn PDF document text
    • https://wunapeno.weebly.com/uploads/1/3/4/6/134621426/6765612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 4980 bytes
SHA-256: f7b9a9e2e9075875c30e69f07d15a01d3b2f13a1b53ab3dfa14419baa2f66fc5
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10280 bytes
SHA-256: 36215fd7937111513805d61cedd0811f09e043b3940ad4c66e40998e3627cb50