Malicious PDF — malware analysis report

Static analysis result for SHA-256 8680a9f116bcae99…

MALICIOUS

PDF

74.5 KB Created: 2021-04-29 14:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8acaf6060d4b984974adf677d9d3daee SHA-1: b74dd4eae60924d9354dd837a9366277fdc91032 SHA-256: 8680a9f116bcae99638abb13e929cd9c04d020d9db7b95c7f505357cb89ffbff
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://jumiwimov.ru/strik?utm_term=what+is+true+happiness+essay PDF link annotation
    • http://emirofficialzm.com/adfg_file_hunt_report5jtd9.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/lezazirasaramuf.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/how_to_prepare_for_a_successful_interview.pdfIn PDF document text
    • http://winoorama.space/27167034534g0gee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6067cb7b7fc7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_6003a66822509.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/bewise_classes_notes_gk.pdfIn PDF document text
    • http://tetalote.22web.org/79673950672.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/carnival_cruise_ship_deck_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_603081ca0251d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_6005a8352f299.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/ca600000-2abe-4321-bb3a-f9d40c2cc084/vekutatutiv.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/9444865135.pdfIn PDF document text
    • http://xosareregaka.epizy.com/melefekajaxexegowemovud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28457470-6190-49e9-852b-8526f78f0e07/dewalt_sliding_miter_saw_cordless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4189ae12-c86b-4538-9c47-cdb162a8e34e/18958691094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006aeb77-4993-4596-b4e9-1944ffe32ff9/volkswagen_service_department_hours.pdfIn PDF document text
    • http://pafapijeneradab.rf.gd/riesgos_de_trabajo_unam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae251547-83cc-4a06-864a-8c9ac373ebe1/pidofuzufuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd69e662-e3d3-4ce6-968e-16a9cf86562d/principles_of_biochemistry_moran_5th_edition.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 4992 bytes
SHA-256: 0770b1e2af961624156e816a14bdb05a53b4f3015349ab870193cb1827db9811
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10752 bytes
SHA-256: 0b2d7ab9a83c1d45f3b79177cdf3ebb1c0947aedabc4dde53c69b19d31d834ef

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