Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1f426ba3f78a0d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-22 13:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adf311fabd8479de95925af36ab2dd56 SHA-1: e2358baf20b78aa5a3236bf929f186633ac02f82 SHA-256: fc1f426ba3f78a0dfdcc9f9726d75addcb4f4021f3224f5aa4983cffebdb5065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including one to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting malicious intent. Although no scripts were explicitly extracted, the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/123?utm_term=ohio+odometer+statement+form
    • http://gratoramaa.website/harvest_manjula_padmanabhan_charactersoj683.pdf
    • https://cdn-cms.f-static.net/uploads/4372382/normal_603176faabb3f.pdf
    • https://static.s123-cdn-static.com/uploads/4383574/normal_5fc5914875a8b.pdf
    • http://hallop.xyz/3_gallon_central_pneumatic_air_compressor_partshn6wy.pdf
    • https://cdn-cms.f-static.net/uploads/4371014/normal_60282690d0057.pdf
    • https://cdn.sqhk.co/gisepavuv/c6hjji7/plain_color_rolling_tray.pdf
    • https://cdn.sqhk.co/jalafimimodo/jiHO3hb/college_basketball_coaches_highest_salaries.pdf
    • http://sellamorem.com/18941835977nsf00.pdf
    • https://cdn.sqhk.co/kusedesomawa/dy7jchj/55836796814.pdf
    • https://cdn.sqhk.co/betewulo/akODchd/apple_pie_recipe_dairy_free.pdf
    • http://iuts.space/how_to_root_samsung_galaxy_tab_4_sm-t231_using_odin8zl7g.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_6034217566c0c.pdf
    • https://cdn.sqhk.co/pakebisas/oXaBPBu/centroides_de_areas.pdf
    • http://marinarus.space/54173320478yzw13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_425b829a7e88467c8f1639d7e8c43885.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/putalogewisetiberalajati.pdf
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_d04f68462ab64394ab2988b32107132f.pdf?index=true
    • https://s3.amazonaws.com/wupagivoz/solitaire_collection_for_windows_10.pdf
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_a55a26eef0c54231bcd46609c3ca32fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5681084f-3cf7-4fc9-bbd2-454eb4940641/4480715847.pdf
    • https://s3.amazonaws.com/vukujidor/fluid_mechanics_equations_cheat_sheet.pdf
    • https://s3.amazonaws.com/limepusotanal/zugawasemuvabediku.pdf
    • https://uploads.strikinglycdn.com/files/aad46c35-f07b-43c0-81a5-5a7f2ecb9f9d/the_latest_news_on_covid_19_in_ohio.pdf
    • https://s3.amazonaws.com/genukopapovixo/70685034671.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e896.bin
c66e37d87002bc712c9319e452911ea56ab067aa6e1a99c84029049dceb7054c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 5140 bytes
font_01_sfnt_off0000f9de.bin
24433b177afc6fe3ef05c2d3fde420053f39a273c8281c745e9a6f10a9d5838a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10512 bytes

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