Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc89003257344f7…

MALICIOUS

PDF

71.5 KB Created: 2021-04-24 23:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c840d16b1d643dfc125f18297d6777 SHA-1: 22cd6f105d75cac6611a97c37f5c902f53844ab2 SHA-256: bfc89003257344f7fe40adcec2ec92865e32462523a437187a9716463265edbc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://zajinet.ru/strik?utm_term=diccionario+biblico+cristiano+reina+valera'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external links, suggests a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=diccionario+biblico+cristiano+reina+valera
    • http://kajejib.medianewsonline.com/oasis_don_t_look_back_in_anger_piano.pdf
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6035aebf1572f.pdf
    • https://static.s123-cdn-static.com/uploads/4381085/normal_6003ee162fd3e.pdf
    • https://cdn.sqhk.co/sebixodof/gcgeeja/xovinorusofixebo.pdf
    • https://cdn.sqhk.co/zuronenom/jXdzh1t/zazumisamadi.pdf
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fd04a2cb69d3.pdf
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5fdcc8411b9f5.pdf
    • http://zokidinodajives.getenjoyment.net/ar_55_46.pdf
    • https://cdn.sqhk.co/javomekoru/igpgdvA/hotel_price_comparison_sites_trivago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fojaxexino/tp_link_tl-wr841n_configurazione_repeater.pdf
    • https://s3.amazonaws.com/wemupajese/application_form_for_dual_citizenship_in_canada.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_6549c363a7ec4fffbb41a2f190369c85.pdf?index=true
    • https://s3.amazonaws.com/ponivotigegepub/death_note_misa_amane_age.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3aac25b0cde74ad69e983ee5c33d832f.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_1ed8fc4c394a402995886bb7afd92dad.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/nootan_physics_class_10_icse_solutions.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_dab1441d044f48c38d8c7226ce38fd87.pdf?index=true
    • https://s3.amazonaws.com/tubukeganuji/dopt_guidelines_vigilance_clearance_for_promotion.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_61c1d726f46a478da6cc8fbf651bffdf.pdf?index=true
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_39e97835e81748d99c1711e822783b7f.pdf?index=true
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_f3626c2197714a7d94c4db1d58dd778a.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_9a341356aa4f4f23969f7ad4ba393fb7.pdf?index=true
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_6fff29a3c9854cd6bca287eda24d0680.pdf?index=true
    • 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_off0000d97f.bin
b32847946ebd277f2ac8ec6d97a1aaeeadfd07f7c0abec22880da9274c6e4eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 4992 bytes
font_01_sfnt_off0000ea90.bin
5c18e0536693e7b75acb8d4dd2d96751ff30d58aeb358afbb2628e2368ef1d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 11100 bytes

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