Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10f3cd261c9047b…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 09:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b310789c935da999d7ee916c2776ef SHA-1: 9c358626d7ed02841aa510ae2659abb22e72bc46 SHA-256: f10f3cd261c9047b9eb713fb86eb80f121fd774c4f18ac5e01006481ed692260
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://zajinet.ru/strik?utm_term=bushnell+game+camera', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of the external URI suggests the primary attack pattern is to direct the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=bushnell+game+camera
    • https://cdn.sqhk.co/womibakok/iciaSij/cartesian_form_of_equation.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fdb3af4f0784.pdf
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fd7c9b43b004.pdf
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6050cdc437fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4491670/normal_6063a3fb6a03b.pdf
    • https://cdn.sqhk.co/jabakujivim/ge4Jjbg/ufc_results_last_night_prelims.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6047aaeba38b5.pdf
    • https://cdn-cms.f-static.net/uploads/4393911/normal_6052bddb88873.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_605378c0872ba.pdf
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fe1d28295cec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_8c69787c59bb42c4b739f2942a70bbb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/047bb390-4b26-4f71-9111-1a8af923b150/cuisinart_fondue_pot_chocolate_recipes.pdf
    • https://uploads.strikinglycdn.com/files/fb670cff-4c6b-4b79-b237-1565f772265b/dotnet_basic_interview_questions_and_answers_for_freshers.pdf
    • https://s3.amazonaws.com/zusevamasor/psychological_empowerment_theory.pdf
    • https://uploads.strikinglycdn.com/files/057bd393-fb1a-4b9c-a228-f02b7fda42c0/jersey_mike_subs_hidden_menu.pdf
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_2878688cb79045a194cb1c5ed36745fb.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/gegifisemexobezadu.pdf
    • https://uploads.strikinglycdn.com/files/27984232-269c-4dc8-a643-5b8cf7cf3b29/34782709008.pdf
    • 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_off0000eaae.bin
e21f1f712ac04afb8c14dae6af51ce2173290b2e8ed3e1f9d78e5beee19c7218
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5264 bytes
font_01_sfnt_off0000fc6b.bin
825d9718d2eec5b2276395cab6ed9b509bc86837a932627b1775e18543127d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10528 bytes