Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb412ea8bc5735f9…

MALICIOUS

PDF

80.3 KB Created: 2021-02-11 22:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c6a65384ac30e8c767f3a831fb56fcc0 SHA-1: 10c72abbaaa0d33a9e0a95684d65faafad05d5f9 SHA-256: bb412ea8bc5735f9cae9143dd9ce13691f7a804e71fdefa4ef736243ff92ecbf
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing 'modern strike online hack free gold', indicating a lure for potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to external sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=modern+strike+online+hack+free+gold PDF link annotation
    • https://cdn.sqhk.co/tupipitijil/ihfggHT/jesowinaruborizowip.pdfIn PDF document text
    • http://copyrightproblem.com/plague_inc_apk_premium_1._16._3td22c.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/RijbId2/ninja_arashi_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_600fd8cc02586.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ijbcjbo/fill_color_in_excel_shortcut.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/rinukixujusenoganesubl83qb.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/ugdijib/cross_border_fee_schoolsfirst.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/Uyegdhc/birthday_wishlist_meme.pdfIn PDF document text
    • http://weragefiz.22web.org/wexagobogopalunevuralanod.pdfIn PDF document text
    • http://tiktokhd.design/sawoninamwb73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_6014f77a4ea7b.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/caracteristicas_de_las_neoplasias_benignas_y_malignask0tlf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazigolukujo.epizy.com/xaraxodiwewamezu.pdfIn PDF document text
    • http://ruvowepager.epizy.com/66986133552.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_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 5352 bytes
SHA-256: 2839db0d7d056d48a9aadb081108c48692791369b9c052f1e8c381aacf8995dc
font_01_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 10716 bytes
SHA-256: 283b55664fc145ee6a76cc64a317934a6aa3102de3824e39c04f8a328a73286f

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