Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0ac307536f43d7…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 15:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13c98ab7446e0cb99f22446a4fc14932 SHA-1: 3d1c57bc6e9225c263d5e80db885e534ec6d72d1 SHA-256: 4f0ac307536f43d7e138f46e914e55b79c7a31b45c2f8165e1b8922dfea37abe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+smoke+a+brisket+big+green+egg PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fe13adbb8efd.pdfIn PDF document text
    • http://fabulouss.space/latuzapaduxavotupurijc9smq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_60524d5869725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_601ec324b10a8.pdfIn PDF document text
    • http://lnstagramaccounts.com/muscle_spasm_treatment_home_remedies6z8ic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60286c83434b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6061d7732e3ad.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/rubidokezive/liquor_inventory_spreadsheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/best_face_sheet_masks_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/subway_surf_hile_cretsiz_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/my_cloud_home_duo_16tb_2-bay_personal_cloud.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f65a672261754c0eaef0c40d49b597f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukiza/360_security_antivirus_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36845416-0383-4b51-af58-2af0b2b05285/19645014243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadb389b-a1fe-4101-a1c0-99bfcba7e24b/music_appreciation_curriculum_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/90029140809.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/guia_de_ejercicios_de_identidades_trigonometricas.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_9cd8cc4469244a56b18a99d2d014f7c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/49832377215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3226caf-ab8a-47d2-93c5-2e25a450e5ee/tisuw.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/max_cleaner_antivirus_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5232 bytes
SHA-256: 7b47da7dcb0861ae970cd4dc4f50228837d6b20e804cfcadfdcf978831fffd39
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 11908 bytes
SHA-256: c478e5a61f6f8cbc30a1baed1a6fa74322b7927a457d9c0263e8c1be3109e143

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