Malicious PDF — malware analysis report

Static analysis result for SHA-256 1405b038b22c5c19…

MALICIOUS

PDF

71.3 KB Created: 2021-03-28 02:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ed8c8968b9f2bdbdb7ee54c1d4b0d15 SHA-1: bb8cfec646c0410a3d48db9ae0e91d7e55b09025 SHA-256: 1405b038b22c5c19550ffc38b5b9c0c21d2ee3a89c82b44bbab75bc9abf73581
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

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://kuzutuzo.ru/wix?keyword=bachata+dance+costumes
    • https://cdn-cms.f-static.net/uploads/4468537/normal_5fd779bd6a542.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fda3d1419574.pdf
    • http://meetsalle.xyz/kumugufo9jr8p.pdf
    • http://bossyonlinex.com/congenital_anomalies_of_respiratory_system46a4d.pdf
    • http://xofofumireke.mypressonline.com/23130858738.pdf
    • http://romeoplanet.club/62956823425ac463.pdf
    • http://lnstagramcopyrigtservice.com/omb_circular_a-110_program_incomex59ag.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn-cms.f-static.net/uploads/4456712/normal_602a103acbedb.pdf
    • http://vuzetasavuxoso.mygamesonline.org/dotemepibizewexegujilod.pdf
    • http://zatutajijiti.getenjoyment.net/adobe_reader_free_download_offline.pdf
    • http://demuxum.getenjoyment.net/hunter_dps_rankings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_a7f034951d1c43628b309f2c9a9f3357.pdf?index=true
    • http://bisubop.epizy.com/winx_club_movie.pdf
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_6de7113fb61245b594076c1eb752752d.pdf?index=true
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_da20ef2652b24360ac93859a57c42e08.pdf?index=true
    • http://kojevarokor.rf.gd/computer_architecture_and_organization_jp_hayes_free_download.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_off0000d954.bin
6fb12e34d7a0ba279fa9a8e59d150b5695585cb4124b6feffe82e7b5949a6cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5100 bytes
font_01_sfnt_off0000ea87.bin
fa4c90fe1be8162f3e12be72412173c8a8bdc6da6a32acadb6d8f101576379cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 10640 bytes

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