Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b64a523ec2cff7…

MALICIOUS

PDF

69.1 KB Created: 2020-11-14 09:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c4e5170d7f7e9e5f74574e29d247284f SHA-1: 1c948c2044039a1f23d5738a8618d772481ff06f SHA-256: f3b64a523ec2cff79c43051fe411b077acb770dab3f3b61d0755cd366572dde9
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to exploit users by directing them to malicious content.

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://trafffe.ru/123?utm_term=louisiana+pronunciation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fa020a7246de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f88d942f1eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fa451e116197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f9859b7a1eb4.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/mavixu/kodulozoxaruvofike.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/parts_of_the_eukaryotic_cell_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/french_horn_major_scales_with_fingerings.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/61847115728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58031a3-3ba5-478c-ae22-5e44c31fea07/48924569804.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/vapefadexoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4a5e28-3a4d-4084-9f80-b99687beafbc/zweiteilige_konnektoren_bungen_b2.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/kiritigorebade.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/brachial_plexus_injury_management.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_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 5148 bytes
SHA-256: 099c8dcb732caac2fa4b10e7863f804f344f4c9f800a059695653b6535b16ae5
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10880 bytes
SHA-256: 3d4a437d73954101bdad7ac8809e0a026f161f161dcacecc21b679d8f9a0675e

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