Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf75d910f53b535…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 19:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e87658285334270afb3b7ce41a7e21c5 SHA-1: 073a5e1cbf6360cce982f0fb9539147a5ae6dbbe SHA-256: 9cf75d910f53b535f57c1eff45a5373b0049d3aef2fe9b279fd63b193cd13e89
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or spam campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites.

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 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=can+i+update+my+garmin+nuvi+200+for+free PDF link annotation
    • http://jozipuvuwuzaj.mywebcommunity.org/bon_de_livraison_vierge.pdfIn PDF document text
    • http://dajexori.mypressonline.com/12334310222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fed2e4f4d980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5ffdb5e7a84fc.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/automatic_control_engineering.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/32408709580.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/wobuzisibal/wovema.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/beat_the_chasers_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/confusing_gk_questions_with_answers.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/how_do_you_oil_a_grandfather_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e82fec4-baf7-4d4d-8c41-9b50e41b6667/61945268586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f6a90f-fe00-4282-b42d-635f5621c4a4/89035120607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e68d727-83c8-4f0c-8832-ec11f41baf59/sakukezunake.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/11483137699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de06b6d-f287-44a4-bb9b-15a891a54064/jbl_cinema_sb400_troubleshooting.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5492 bytes
SHA-256: 8dfffb362e9d91081e693f1fd274b3b128a9bcecd2b65ce0e9701fa7557fab60
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 10632 bytes
SHA-256: 8700558615e6d83e9697241dd44182a6b54ca348714f6666310b50729d0da386

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