Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac4f2463322682d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 10:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47b746afb71ae8f29023b7ecf14dc784 SHA-1: 5cc38cd4f7e21a450cdda53038022510526c046b SHA-256: 5ac4f2463322682d4ab4648ecb6a588d5ea5d19aa8834cfde761b28b76c5073e
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://seumenha.ru/123?utm_term=sherlock+holmes+pdf+romana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471686/normal_60150fcf39082.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/Jdgeehc/faxozenolixikajuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_60207441d1384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd877f75a460.pdfIn PDF document text
    • http://stopnutristrike.ru/lubamurezingwz8.pdfIn PDF document text
    • http://keepqifi.space/onan_microquiet_4000_generator_wiring_diagramqgu5h.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/4zjgja5/zagitojadimuxoxusesulot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_60460e0d60343.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/iiaiajg/converse_bota_plataforma_imitacion.pdfIn PDF document text
    • http://trickyturkey.com/vogegosabulawotowavujzb36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_6025acb6dda29.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/38FlYFC/cruise_lines_international_association_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_605601da2bffb.pdfIn PDF document text
    • http://podarokinsta365.site/62050282751iqxx3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pejinubonuxus.epizy.com/tarilipedanewopexovo.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/d_d_fighter_champion_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/principles_of_classical_conditioning_in_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/diamond_groundsheet_pegs.pdfIn PDF document text
    • http://bafovupopevepus.epizy.com/32908333173.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/russian_script_font_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5220 bytes
SHA-256: 8ee57cb6aec0d8cf2f5ef0fd97e477ee4e56c3100312ca66d2a1f1694bda4f77
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 9632 bytes
SHA-256: cfd82378df4e02337aeb6890aa840cc062ece39bf30aade18fa454d93aeeda41
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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