Malicious PDF — malware analysis report

Static analysis result for SHA-256 4315f8c81f00e694…

MALICIOUS

PDF

101.7 KB Created: 2021-03-05 00:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50ac9c8b7eab928bdc8cea3f866c67bc SHA-1: 7d268ed1f077707b3c250a88f475d569d86304c6 SHA-256: 4315f8c81f00e694256b8038578ecb52ba8327d3fde68041b1d76ba3ffd403e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to further malicious content or phishing pages, and the document body, though heavily obfuscated, appears to be a lure related to product searches.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=nikon+coolpix+s4000+battery+won%2527t+charge PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fecf04952aa9.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/hiignjg/nasal_spray_for_dry_nose_and_throat.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/OhjidPs/vufofupufakeni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_6003f86c7c74b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_600145e46b710.pdfIn PDF document text
    • http://yoga-italy.space/philips_respironics_remstar_auto_a-flex_settingsh9fri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_602285ef5d147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fceec09df932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fce7576eefa2.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/87496771280.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/the_mortal_instruments_books_set.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_get_a_real_estate_agent_license_in_washington_state.pdfIn PDF document text
    • http://tublitalia.space/32037221387s4t0g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_5fd07045b174e.pdfIn PDF document text
    • http://agentsecure.space/what_level_does_onix_evolvef6k77.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_to_program_dish_hopper_54.0_remote_to_tv.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/how_to_lose_thigh_fat_with_resistance_bands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_6999c7f3cfbc44359f87dda451b42e75.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_62229e391c3743dca833db955236b364.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_5891414574204ff3b2cf5d27ad0ffcdc.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_217aebd4e09e496ab4cc56b261cf107d.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_12caa6dfc13845c69e509aa64677e31d.pdf?index=trueIn 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_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 5896 bytes
SHA-256: 67ccb237099091dcb0bb6f83e1acb4c3371fa688db124e5526ad3d211d12e3f7
font_01_sfnt_off000161a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A9 11472 bytes
SHA-256: 2e9e64e6b0261459110ee51f33e1870cfb8c6c704ccb96d141ca91409c8485c7

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