Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d0db008ca17b9e…

MALICIOUS

PDF

72.5 KB Created: 2021-03-10 01:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b745f441ab5fee494177f5c1f684f405 SHA-1: 1bb986edf3199e7305287513cd50a49060066051 SHA-256: b9d0db008ca17b9e1337461b15dc360eac5889ca4d249972f70511bce7043c80
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 0.9998

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://ponafet.ru/123?utm_term=ada+apartment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494139/normal_602c6f0e94d99.pdfIn PDF document text
    • http://sokfresh.fun/corporate_strategy_definition_and_characteristics5pc2f.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/hwojegf/lowering_cholesterol_through_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600beef77038d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_5ffada2b642da.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/pQhdjgY/fairy_themed_birthday_party_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5fe424cfa7969.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/giEgfBq/strategy_pronunciation_in_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_604318e85a382.pdfIn PDF document text
    • http://accface.in/crime_lab_report_template5f4g0.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/wANifbL/kleptocats_2_codes_bathroom.pdfIn PDF document text
    • http://tujozavido.66ghz.com/borbaad_bengali_full_movie_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/zezovajav/LgngjHd/vampires_wife_h_m_sunglasses.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/iXiciby/85430080061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasugokomelu.rf.gd/lake_superior_salmon_fishing_guides.pdfIn PDF document text
    • http://nilifujajug.epizy.com/yowhatsapp_8._0_anti_ban.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/kindergarten_lesson_plan_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/luffa_planting_guide.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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 5268 bytes
SHA-256: 559cd0533f17da96bfdcce52773a4223b5656a64a2cfceb284a5959c96e592e6
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10340 bytes
SHA-256: 317cd9059bf316b9dad9516f0f18413880d3d265a6d3c2170971023b85d1f50a

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