Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4f3330b4508319…

MALICIOUS

PDF

71.7 KB Created: 2021-03-22 22:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ddf332f724cc30ec982d2904c4a9c1a SHA-1: 9bfb0eed2b70458769f03205500072c7bfd8c996 SHA-256: 9f4f3330b45083199cbc7486ec4714b467d01a70f4717376e88224f0bdb0623c
126 Risk Score

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 0.9998

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://kuzutuzo.ru/wix?keyword=girlfriends+guide+to+divorce+streaming+season+1 PDF link annotation
    • http://xukiwowarenop.22web.org/functions_of_administrative_law.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_601cd4119c87f.pdfIn PDF document text
    • http://esclub.pro/wobufenet7p0.pdfIn PDF document text
    • http://straponartist.com/super_anime_battle_apk53426.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/gorolopirelorizuludoxexixeee2h.pdfIn PDF document text
    • http://geguxejap.22web.org/big_data_black_book_dreamtech_free_download.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/giduwufabejetebenipesa.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/kjjP5ie/27259887525.pdfIn PDF document text
    • http://tujodugugejime.22web.org/47617517245.pdfIn PDF document text
    • http://digitalmicroteter.xyz/love_poems_for_husband_long_distancebctuo.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/qhaODsi/42554495545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_604166d128450.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/4Qdgjge/shiny_zigzagoon_pokemon_sword_and_shield.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakekevuvek.epizy.com/97310024874.pdfIn PDF document text
    • http://bazobajinazar.rf.gd/goxazovetegud.pdfIn PDF document text
    • http://fadosidenisuko.epizy.com/hisense_70_pint_dehumidifier_with_pump.pdfIn PDF document text
    • http://lojurixerura.epizy.com/92496776592.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 5484 bytes
SHA-256: c979e633b45a7a6dd86192ca5b1539fac6490eadb0939d381c92eccf0ef10827
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 10992 bytes
SHA-256: 5c3f8bc6385215ceb0c8b48d9f8ea04982f2a5aba693272d3dfa52846c7eb15f