Malicious PDF — malware analysis report

Static analysis result for SHA-256 41344a7565ba8e59…

MALICIOUS

PDF

76.5 KB Created: 2021-04-14 12:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b91dd3acc5215e803a7650da019342d SHA-1: d6b805bd13ba4c779ea61c6a4234cb4a76ab5612 SHA-256: 41344a7565ba8e59b75b6f91b5334b437a7f3bd55bc0c1651db0fa1dc022f858
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://zajinet.ru/strik?utm_term=turnigy+9xr+pro+price', is likely intended to redirect users to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=turnigy+9xr+pro+price
    • https://cdn-cms.f-static.net/uploads/4425533/normal_60668cd8ab53e.pdf
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/1440441.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/3356116.pdf
    • https://cdn-cms.f-static.net/uploads/4452845/normal_605e0984bb224.pdf
    • https://kofudisefases.weebly.com/uploads/1/3/4/0/134018526/4354568.pdf
    • https://jokenobijejadur.weebly.com/uploads/1/3/0/8/130873794/7339221.pdf
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fd65652823e6.pdf
    • https://static.s123-cdn-static.com/uploads/4485305/normal_6006a3d4d3b94.pdf
    • https://cdn-cms.f-static.net/uploads/4406229/normal_6056fd03e2c9e.pdf
    • http://zarabatyivat.ru/viwizitx5k4.pdf
    • http://opt05.ru/vokegemitutofopuvpe8p0.pdf
    • https://cdn-cms.f-static.net/uploads/4484624/normal_60256968888c7.pdf
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/tazemol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagoba/inventory_status_report_in_sap_b1.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_94faddfd60fa42c2aac48c6829c31ebc.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_9e6409a47aaf4730bda8ad2ff1d18492.pdf?index=true
    • https://s3.amazonaws.com/sukobogixe/cradlepoint_mbr1200b_factory_reset.pdf
    • https://s3.amazonaws.com/besafefaf/85203876160.pdf
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_4ff86505209f474f821cf0b6c1466aa9.pdf?index=true
    • https://s3.amazonaws.com/mexavofezoxi/39057095647.pdf
    • https://s3.amazonaws.com/genijusemu/sort_worksheets_in_alphabetical_order_vba.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_f4127a8b530c408ea96e651def053b0e.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_off0000eec9.bin
89db29d89c90d919dda63e17dc32f5e1ab4e60017b95bf68a274ef649c36be0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 4956 bytes
font_01_sfnt_off0000ffd0.bin
7c0c1f4548ececf69645e12c53ef2087d5f72dda915c148108d7328339c86279		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10844 bytes

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