Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc4fc4b23f8b3bf…

MALICIOUS

PDF

73.7 KB Created: 2021-03-28 19:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0859241bb07f23464f25b2b8e735888 SHA-1: 7a84b288add8c9846e6141aab1c591bdc4ea8724 SHA-256: 5fc4fc4b23f8b3bf23c2783ab06e0e209ddd7c72823da3e78a1089fc2f65e7a9
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=health+and+physical+education+book+class+11+pdf PDF link annotation
    • http://zutatowatipo.mywebcommunity.org/misplaced_modifiers_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fe9634945038.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/tikopusoparar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_602cb27147fea.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/14658580648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_605f8a0f0b960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_5fca669d4d749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezutu/why_doesnt_my_landline_phone_ring_when_i_get_a_call.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/brche_krzen_erweitern_bung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370598ab-8bfb-496a-bf8d-761644bd80af/warcry_slaves_to_darkness_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5ad6a7-f167-4073-9a7e-61aee63f5318/38943064438.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/16128043493.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/goodwill_safe_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f15bd4-5a60-41ef-b682-50b382ef5209/nugasirede.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/symmetrical_patterns_worksheet_ks1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baa406d-fbe2-4c00-9e32-9f9f615091aa/vuxixiter.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/acoustica_mixcraft_4_free.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/how_to_do_a_backhand_serve_in_table_tennis.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/deloitte_digital_transformation_executive_survey_2018.pdfIn PDF document text
    • http://jafuzoteneg.epizy.com/muxade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d317e7-3299-4021-b24a-0cd970b73f7d/how_to_read_electrical_drawing_plans.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/kung_fu_panda_cast_mr_ping.pdfIn 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5468 bytes
SHA-256: 8a172903b5abb8d2026c8bdc1c08c9ff85df3cdf16a3734ad8e0ce04f536b855
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 11476 bytes
SHA-256: 1bf588e022c535988b89a278c96c8410118a43b640202e3e4c86fa007dfc5f40

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