Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6298b353c2b06…

MALICIOUS

PDF

69.2 KB Created: 2020-11-21 23:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d2034b1ba276a927aad6c19b6a86d338 SHA-1: 1e9b42476efcf88ee19217a2aa80637afb3d0e80 SHA-256: 8ff6298b353c2b0637567da119150febf338b8fa4c77ccc693cf12b1ae235114
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=gray+hat+hacking+5th+edition+pdf PDF link annotation
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/rusajewuja.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/somudemudi_mirisaxof_bivifozur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f9b9b105498d.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/pefen_xezoju_fojirapofaza_gunovotenip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5fb2e7c05637e.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/ruwitawogo_rusajexedav_lusepapa_takibikezuro.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/nofib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5fa9e605657bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5f9235265b9f3.pdfIn PDF document text
    • https://sikewebuki.weebly.com/uploads/1/3/4/3/134387003/c5017049a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_5fb00d12e5384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40aee3af-1fa6-49e0-8ab3-f24dca5b1335/spike_land_before_time_dinosaur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5f7720-2864-48b4-b4db-d88d089b7a63/west_trenton_line_schedule.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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5528 bytes
SHA-256: 134d88d3f95c30aaa951f36c9ecc758ff91b07c3b55bde6c5119e94d324c7142
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 11556 bytes
SHA-256: f38bb888dc302b1d52c77cb0f7d97b5e7edf703965de8a6fb64f9bd77bae71c1

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