Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce1dabdcf74700f…

MALICIOUS

PDF

86.3 KB Created: 2021-05-19 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad46b2ebf14ee6b828e5e5dee8df74f SHA-1: 503c36d36dd930e5785431b76165452edd801acf SHA-256: 1ce1dabdcf74700fe30290013c9eb16cab6e21c747ccc8320ffc459728f03af6
96 Risk Score

Malware Insights

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

The PDF file, masquerading as educational material, contains an embedded URL that redirects to a malicious domain. This indicates a phishing attempt, likely to deliver a secondary payload or redirect the user to a malicious site. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+to+study+for+7th+grade+constitution+test
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6052e0ab45c85.pdf
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ff1cb0f65196.pdf
    • https://cdn-cms.f-static.net/uploads/4375195/normal_603b13f3e76ef.pdf
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fe0a6a3137e7.pdf
    • https://cdn-cms.f-static.net/uploads/4406777/normal_60127ed973a55.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_604d0bb1c319c.pdf
    • https://cdn-cms.f-static.net/uploads/4478125/normal_60674a1628d8d.pdf
    • https://cdn-cms.f-static.net/uploads/4393761/normal_60251f8919250.pdf
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5ffdb929e75f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/resosozibekukedib.pdf
    • https://s3.amazonaws.com/gogoxowiniza/dejek.pdf
    • https://s3.amazonaws.com/gotenukevepunin/zumujumami.pdf
    • https://s3.amazonaws.com/dovulavavo/81673233701.pdf
    • https://s3.amazonaws.com/gifiz/voreraloragesog.pdf
    • https://uploads.strikinglycdn.com/files/d024f419-f543-4e91-b44a-dbce212f0b51/setiretenigiseb.pdf
    • https://s3.amazonaws.com/sagotomagin/how_much_does_a_pmp_certified_project_manager_make.pdf
    • https://s3.amazonaws.com/bededuxotulapil/59595857787.pdf
    • https://s3.amazonaws.com/gixawetopoli/32737015685.pdf
    • https://s3.amazonaws.com/nowonovege/nijutusodigadotare.pdf
    • https://s3.amazonaws.com/mexesazaxasa/how_to_repair_windows_10_operating_system.pdf
    • https://s3.amazonaws.com/jupudizadid/how_to_calculate_interior_angles_of_a_polygon.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/71358607942.pdf
    • https://s3.amazonaws.com/zufojadibi/individual_development_plan_for_managers_template.pdf
    • https://uploads.strikinglycdn.com/files/4a9b2416-0f94-45e1-8954-bad943c802d3/what_jobs_can_you_get_with_a_degree_in_management_information_systems.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_off00010f17.bin
fc11d1ace71374d9a645232b7dabc184c69395357bbde10256c56031ace75d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 5484 bytes
font_01_sfnt_off000121d7.bin
01502a20a705f6cf4b44dbf3bf78e19a7eac703b9250b2bf9e26c29719445ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 11784 bytes

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