Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e96ecf7d65a9ef…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 18:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d2af09db9cff74618a7d4e4c94ef0450 SHA-1: fa6f2cdabfda7a96643ff12c675f715fdc921074 SHA-256: 04e96ecf7d65a9efa31df8c19c425df35ea131c97eeccf625d0bfd58e806b9e6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The embedded URLs are designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=microbiology+laboratory+equipments+and+their+uses+pdf In PDF document text
    • http://vertigoa.online/how_to_compare_grocery_prices5stgv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_5fde52d50c037.pdfIn PDF document text
    • http://cparta.moscow/bagotubxz39d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_605ac7acb9b49.pdfIn PDF document text
    • http://aires.fun/what_streaming_service_has_the_road_to_el_doradohcx5z.pdfIn PDF document text
    • http://cmbespaceclient.xyz/chick_corea_spain_transcriptiont83ry.pdfIn PDF document text
    • http://goodnaturak.space/49129961780tdtlo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62c68f1a-b463-400d-b6d7-27fef4968056.filesusr.com/ugd/1d3654_ee5f53b3aaa94584b07b43b7ebb46ba0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb78035-2662-49dc-9d02-3f28711a0d7c/how_to_clean_a_dr_brown_steriliser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5500ca5-5371-4cc3-96c2-5bb10983e908/celestron_powerseeker_70az_parts.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_195b898e48854731b9c24743a0d0e5aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35239475-0d2f-4622-b0e7-25ee0be87515/active_and_passive_voice_worksheet_for_grade_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12289d16-a2a9-445f-b392-de92e55acf51/how_to_connect_the_tv_to_a_projector.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_744f4724497c4d7698e044aa527c8bb5.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_261cf14fb6844bc0b0ceae88b6be7377.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0800fbd4-e54b-45e4-b775-b5211ced9d0d/segunu.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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 5944 bytes
SHA-256: 229a698c8b03d23d955716013625dc10069b9500bcf74086ca27575a7e6c73f2
font_01_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 11200 bytes
SHA-256: 8e147af804e8b8ba197dc311bad68538d95467004288ce035dfe9017613e649a