Malicious PDF — malware analysis report

Static analysis result for SHA-256 16882253d10f07e2…

MALICIOUS

PDF

66.6 KB Created: 2020-11-27 05:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: efd4cc02c292e5baa6a1ddfe3817e6ca SHA-1: ededf1d3fc75454c812120c365042f3e32d892a5 SHA-256: 16882253d10f07e2c68628407b28b436d4ce4f4c422291ea02f665bfd753edd2
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by heuristics as potentially malicious and flagged by ClamAV. The document body, though heavily obfuscated, suggests a 'quiz' lure, consistent with phishing or malware delivery tactics. The presence of an external URI and the ML classifier's high confidence score indicate a malicious intent.

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://trafficel.ru/strik?utm_term=skull+foramen+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fa71b5ceb345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fa4ff24a786a.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/vekodupiwarobi/10606272350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5852c28e-a1cc-4e2a-b8b6-2cceeee7c626/rirujilamisafoxonovafotu.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/34860460881.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/simple_phone_answering_machine_for_seniors.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/world_conqueror_4_redeem_codes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfafb55d-13ed-47a7-acd4-abdf77d91114/negabumalibanuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/sitefitef.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/revozobifugegubewes.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/28584573408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf8e758-847d-4bff-96bc-c1fa2904a677/1556161971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3969ae68-7238-48cd-b8cb-ef3c9b36511d/20304525217.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/buxixozizelufuti.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/wevivevafufaxuv.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_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 5080 bytes
SHA-256: 52790ab5130a538881430ad7f768303913f3b9313b19864fe2c0bb1dcfc72185
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 11120 bytes
SHA-256: f29c7bc005e31de07f10d0c3737e21315f77bad2d250e6a444683f32286c1649

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