Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33b6004c527653a…

MALICIOUS

PDF

82.8 KB Created: 2021-05-20 02:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8000e64fddf80d629b5d9761dbbb43f9 SHA-1: e15d8a74d7e58b78796ab56ddc08fa8fbe7f1f33 SHA-256: c33b6004c527653a5de0885d9aef393a3e9e7d06a1fa533b69196b4a03f19346
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that points to a URL promising free game downloads, a common lure for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=the+binding+of+isaac+rebirth+free+download+ios
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657f3d085d.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_6050765849212.pdf
    • https://cdn-cms.f-static.net/uploads/4408703/normal_604e9cf8d9f7c.pdf
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd1a96105fd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabisura/25276489913.pdf
    • https://s3.amazonaws.com/sazixipame/13960770679.pdf
    • https://s3.amazonaws.com/remeranexe/jaxulijulaxaseg.pdf
    • https://uploads.strikinglycdn.com/files/67ed139f-2059-4ba3-a335-7e8ba09a1caf/should_the_word_presidential_be_capitalized.pdf
    • https://s3.amazonaws.com/wizomoravazub/dark_knight_guide_bdo_2019.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/canon_eos_750d_guide.pdf
    • https://s3.amazonaws.com/wulotugadag/16816295552.pdf
    • https://uploads.strikinglycdn.com/files/7dee994f-7e12-4e09-adef-3ddbd296d826/83930842304.pdf
    • https://s3.amazonaws.com/jazamerijekufol/advocare_protein_shake_nutritional_information.pdf
    • https://uploads.strikinglycdn.com/files/b9fc3420-6472-4e19-9493-23493168ea6d/fenowafemapatapibuxe.pdf
    • https://s3.amazonaws.com/papuja/attendance_tracking_spreadsheet_excel.pdf
    • https://uploads.strikinglycdn.com/files/2a70874a-b94a-4702-8b93-11a6d6fcee45/el_proceso_de_la_investigacin_cientfica_raul_rojas_soriano.pdf
    • https://s3.amazonaws.com/tokudapele/how_to_use_the_dash_egg_cooker.pdf
    • https://s3.amazonaws.com/vanatul/aligarh_muslim_university_phd_form_date.pdf
    • https://s3.amazonaws.com/xilasisefi/instruction_manual_template_word.pdf
    • https://s3.amazonaws.com/domegagowevag/formaldehyde_free_conversion_varnish_sherwin_williams.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f755.bin
5b8bf569a73ae284eb5a26e4d2a9ef5005642a146d03c4cffee53ea1439d5923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 2988 bytes
font_01_sfnt_off0001020b.bin
62ca35b086dc950e4e51a535c126b87a795f8aaf6ed0fb751d04ed1d64693896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 5464 bytes
font_02_sfnt_off000114b1.bin
80ec7845eb4068d4c633af07904ffe4b7bc395051ca3420ed758b0fab78fb305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 11912 bytes

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