Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21da070e1940904…

MALICIOUS

PDF

79.7 KB Created: 2021-03-22 15:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87d40221cd06f85ade45beaa4b1c5944 SHA-1: df9921d3532b04eb8c2eb8d66587b41ca0db8922 SHA-256: b21da070e1940904385d377912f81ad26b5e89144b89b201c70341b83ae794ce
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits multiple high-risk heuristics, including ML classification and ClamAV detection, strongly indicating malicious intent. The document employs a social-engineering lure, instructing the user to install a browser extension or plugin to view content, which is a common method for distributing malware or stealing credentials. The presence of numerous external URIs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pelibifir.ru/wix?keyword=play+view+apk+8.2+download PDF link annotation
    • https://cdn.sqhk.co/tamoravuwera/fOghXid/dallas_stars_travel_hockey_league_schedule.pdfIn PDF document text
    • https://kimilirakafame.weebly.com/uploads/1/3/4/6/134659192/7269467.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/a626d29d621e.pdfIn PDF document text
    • https://xokapajutubesa.weebly.com/uploads/1/3/4/7/134730315/1d41a1c8f.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/cdsco_approved_drug_list_2020.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/80630654433.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/dojodiwometi.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/56047428562.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/zumudisaxexun.pdfIn PDF document text
    • https://cdn.sqhk.co/gibewuzavi/CvzwgiO/wefakefutisit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fd76f3a81f4c.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/how_to_use_nesco_american_harvest_food_dehydrator.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/921010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe064c43026d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_6034f19389497.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hgnihdo/pro_pinball_the_web_iso.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/dafumuxitupav/81540181270.pdfIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/porigiwaviviguxive.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/jobujevogugiberigas.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/photography_books_2020.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_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 5356 bytes
SHA-256: 8be0a90621bfbd3bbb9196844f7c7a64d3cf58b9b14d3268715a2b4a78eb182b
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10904 bytes
SHA-256: 53e085b72d3f610ac2d110b44e1be76d3d569ff59b5c1cbf211e74751d32d8de