Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ad4424b53c3351…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 20:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a3c1eb48330063e7dc3fcff65f677199 SHA-1: c73e784f83c47910b701e7f4b59d42143b64cf99 SHA-256: e4ad4424b53c3351d43ba70883a5c54ee2339f6a605f3fd5fe73bce934400281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a primary suspicious URL identified as 'https://botokaw.ru/strik?utm_term=allied+hydraulic+floor+jack+parts'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO poisoning tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

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 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://botokaw.ru/strik?utm_term=allied+hydraulic+floor+jack+parts PDF link annotation
    • http://gexomafe.mypressonline.com/articles_dfinis_indfinis_partitifs_contracts_exercices_corrigs.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/boss_dr_880_buy.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/dazukoderepidosivuzogi.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/american_heart_association_diet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_0465e1c0bbd446a4b6d4d89bd7eda4cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/ritoladuwakopanu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/29657971238.pdfIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_7be13c41ed1d4c15b68e23bd0ae9d272.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wugikefarobirapufusigi.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/best_graphic_design_resume_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/baltimore_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/gunakaxevu.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_dcd9bb32ac05467a93f1623c343dc505.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/2013_dodge_charger_for_sale_by_owner.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/92121700209.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/seputuv.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_383f32e224794bc08407b3363d012cda.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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 5476 bytes
SHA-256: 5afb81221a1ba335421358d2ecc82645b3837f72c137bf0d6b4f6b0b641f938c
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 12016 bytes
SHA-256: 617397e5742baebfae1ee9ac2a8d020054c4682acbafba19e1897d4d66d6e59d

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