Malicious PDF — malware analysis report

Static analysis result for SHA-256 638433a88ed621eb…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 13:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 089bc3c04bdefe6f022d03fd414b016e SHA-1: ed7343c526fc40ebeac34f85edb26fe9f4bcf6b0 SHA-256: 638433a88ed621ebb5cb4883aee0fcbd358f266644abc67148d06aeaf0e26d96
126 Risk Score

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/wb?keyword=compound%20complex%20sentence%20worksheets%20with%20answers PDF link annotation
    • https://cdn.sqhk.co/wexazaruko/hhKZQ1C/13836192854.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/solamanobadax.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/iGGhhQ6/hd_wallpaper_iphone_7.pdfIn PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/rovave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60112e30565dd.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/zBKBJje/dungeon_keeper_gold_level_4.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jdXic3Y/my_etisalat_internet_account.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigisijopa.epizy.com/solving_quadratic_equations_with_imaginary_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/33633119665.pdfIn PDF document text
    • http://bixikaw.epizy.com/lijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/picsart_pro_apk_happymod.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/genetic_engineering_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/guild_wars_2_classes_guide_2018.pdfIn PDF document text
    • http://zonefodewev.rf.gd/12149519836.pdfIn PDF document text
    • http://zikajubagunefef.rf.gd/what_is_appendix_in_report_writing.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5440 bytes
SHA-256: 1368bc44d43a407e2b01ed462298ca60d064016ccc94f1518f54a207f1c50517
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 10588 bytes
SHA-256: 3884f3f46fff092804780512ada47daf60dc5ef49bfd9e9abd05ec80c7d2ab3a