Malicious PDF — malware analysis report

Static analysis result for SHA-256 d758f6a263ec3822…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 18:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5636906eb220e9cf79a2f62a3c611756 SHA-1: e4340efbf205e2ec74160d8cdd9a3463f7d9a02f SHA-256: d758f6a263ec3822dc0e7794f74fd17703aa2e56bca7c75a07031fd71dd10531
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to disposable domains and Weebly subdomains, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://jacksth.ru/strik?utm_term=excel+functions+cheat+sheet+2016, is likely part of a phishing or malware distribution scheme.

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 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://jacksth.ru/strik?utm_term=excel+functions+cheat+sheet+2016 PDF link annotation
    • https://cdn.sqhk.co/ravuviwidi/r7hbDhj/pofeziba.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/3hjhf8i/farawabikibegazowubapuru.pdfIn PDF document text
    • https://regumalewa.weebly.com/uploads/1/3/4/6/134694163/xarofatipop.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/b837ba8aeb9.pdfIn PDF document text
    • http://xteenware.online/memorandum_report_brl-_mr-_38776zg9g.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/Shd0bij/madrid_zombi_2_apk_full.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/79d150b8e.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/basijejoranusife.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/2088635962c.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/Yijihji/star_trek_fleet_command_review_2020.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/87012922827.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/31601646178.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/inkscape_cricut_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/aXijbja/free_kick_goals_record.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topemuzopapegu.epizy.com/39938209124.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5376 bytes
SHA-256: 028e712a8e0d109b6a5e36333fd60f59352706be92d82274372d1261344070b4
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 10912 bytes
SHA-256: 119bb0c4cb35b90d0169ae71d2ea4ad8745496c4161f0a4e49af30ffcae44c54

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