Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c02d4a13f2ea3e4…

MALICIOUS

PDF

75.6 KB Created: 2021-04-02 13:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13dffc89634b86437379479de0ac1405 SHA-1: e65eb22633baafb9148411a669cce14d98aba580 SHA-256: 6c02d4a13f2ea3e4be0a2f4e567a97e6071ddd9f7c7913ac39b951a5b8ba29c9
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. The presence of numerous external links, including one to 'kuzutuzo.ru', suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=how+to+download+chrome+on+lg+tv
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63dcc77a85.pdf
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5fd6f079bc53e.pdf
    • https://cdn-cms.f-static.net/uploads/4405206/normal_60201f6665bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60130c487bbf1.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601d7045602d5.pdf
    • http://handler-autoscout24.com/dark_empiret0pfw.pdf
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6056e7f83326a.pdf
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5fe1f3e21f6d1.pdf
    • http://xanuxitawunavi.iblogger.org/the_hobbit_download_in_tamilyogi.pdf
    • https://static.s123-cdn-static.com/uploads/4490141/normal_60034814db64a.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn-cms.f-static.net/uploads/4500187/normal_601f14368dfaa.pdf
    • https://static.s123-cdn-static.com/uploads/4485809/normal_600191e4d1138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://medomapex.epizy.com/83713412625.pdf
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_0f2a94f2476e4210a447c2ae268b5f1e.pdf?index=true
    • http://jepameji.rf.gd/danganronpa_2_class_trial_3_guide.pdf
    • http://rigitusavogu.epizy.com/mubujo.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_777ac9ed23e24783aa8cde03de13f82a.pdf?index=true
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_63a18f783b9d4599842c451ed631a3f9.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_off0000ea31.bin
4ce3533f535df1f13b701663e84a8a9641e5156b5a7b7015dd04b6535692ef1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5288 bytes
font_01_sfnt_off0000fc19.bin
b079ae41ad858495575cb7babd47a59278656192aaf91ffa5255255c6dcd8d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 10788 bytes

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