Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c63545ea04f8e7…

MALICIOUS

PDF

88.8 KB Created: 2021-03-03 05:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ce5cd7f800a1c5161024f0f0e9a4843d SHA-1: 9a615a6486c35921742aae63c18307fb890706e9 SHA-256: e4c63545ea04f8e752c41fe022de5f8502cbba73098eb2b25580ef38926edd72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are SEO-themed and point to other PDFs, suggesting a link farm or redirection mechanism. One of the embedded URIs, 'https://kuzutuzo.ru/wix?keyword=la+civilizacion+del+espectaculo+resumen+por+capitulos+pdf', is likely used to direct users to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=la+civilizacion+del+espectaculo+resumen+por+capitulos+pdf PDF link annotation
    • https://cdn.sqhk.co/vanewano/NDhafha/groundwater_recharge_from_runoff_infiltration_and_percolation.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/jhBhfjg/hoop_code_basketball_academy.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/R2ed7MQ/fepuxumas.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/ic9jjji/animus_harbinger_mod_apk_1._1._7.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/lQt9Oii/absorption_spectra_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/ToHlutC/critter_escape_car.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/jbBihjd/xozabirukuzorobamed.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ggaddhe/69339574709.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/2d21c.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/0gyJgfP/lucky_block_race_server.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/Rf4tifo/vakoxujuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dOlDAjh/is_my_bowling_ball_dead.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/subuwufubaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/hgdVijx/background_images_hd_windows_10.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/jinabom/internship_report_hospitality_management.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/manewagufabijaniruvotuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/40382836629.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/79253400986.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_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 5352 bytes
SHA-256: c59d9c667e5f3ba02d068743a53db6f95a7cc10bb4aed3710cd409cddab48bfd
font_01_sfnt_off00012fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE7 11528 bytes
SHA-256: 5081a2841a867fad12bf057c43796337c68d5b2ab2f1a6bb583d6f2accb7de99

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