Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e24743c329f2a0…

MALICIOUS

PDF

85.4 KB Created: 2021-04-08 20:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e31aaf3017070199170a3028976684e SHA-1: b1454b905e772b8bfee2a07ff1d4bea763e4d2e8 SHA-256: b1e24743c329f2a0b46755827022f8c670b604ba5042d788b3c54b8a8c0c3a75
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=does+microsoft+word+have+certificate+templates
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601f0ddf39e1d.pdf
    • https://cdn.sqhk.co/nazopekujavi/GChTWjc/15011381150.pdf
    • https://cdn.sqhk.co/bafuberudod/ghWYhW9/80784731946.pdf
    • https://cdn.sqhk.co/xedogigiloli/jhijfan/arkansas_franchise_tax_report_extension.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_60321ee6752aa.pdf
    • https://cdn-cms.f-static.net/uploads/4372105/normal_604b347adccf1.pdf
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6063f6a402c8c.pdf
    • https://cdn.sqhk.co/xenivoronizu/hiSjhR1/fiwaw.pdf
    • https://cdn-cms.f-static.net/uploads/4416938/normal_6059d1ac9e7d5.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625ddd5903.pdf
    • https://cdn.sqhk.co/serodozire/ggSibZf/new_photo_editor_online_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_2541292c86bb445ab8429f4f9cdd50c1.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_35108fb5f58a473697ae764ec5f35c7f.pdf?index=true
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_e676d93540d84cb4b414b06029230616.pdf?index=true
    • http://rifedemukipozo.rf.gd/37537481299.pdf
    • http://bafimilatape.epizy.com/73659674898.pdf
    • http://labireninofut.epizy.com/abbyy_transformer_3._0_full_mega.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_f090004854004b60bfc557ea10265ac6.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_2e18072bc2d64888b51bf7ad38b974fa.pdf?index=true
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_de4201a408534875af48d488700c190f.pdf?index=true
    • http://dizonesexow.epizy.com/cuenta_conmigo_pelcula_completa_en_espaol_latino_descargar.pdf
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_927ae15adbc344d2975100aa026dd4b7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010445.bin
8e2bd19adee887203b301e2704c3f9be949de01b0c6ee2e89e951fe1d3cfffc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 5228 bytes
font_01_sfnt_off0001161c.bin
103a8a3dcd3b5fd840e7dab6e4bab719cda6915733129b15bc957523bca9de54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 10308 bytes
font_02_sfnt_off0001397c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 4324 bytes

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