Malicious PDF — malware analysis report

Static analysis result for SHA-256 06776b0d5027ae12…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 23:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce7466639c36991f58ba7ceca327f51 SHA-1: 0f688ea64100a9ce9170634aef417f33294e55bd SHA-256: 06776b0d5027ae1215ad9e2d5626181fc34e1480014685a2664da79b6360482f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=solving+exponential+equations+worksheet+answer+key
    • http://trikotoria.ru/state_capitals_quiz_with_answersm562r.pdf
    • http://dapurixid.sportsontheweb.net/61577784995.pdf
    • http://goldstein.capital/zanekuqfpfp.pdf
    • http://justiciaforjustice.com/city_of_calgary_recreation_program_guidelhr3g.pdf
    • http://xruhdfo.site/58386501012y0rjn.pdf
    • http://fikosigupim.22web.org/bipasidiseva.pdf
    • http://pexawegowe.mywebcommunity.org/85415958068.pdf
    • http://damvglaz0.xyz/english_language_and_composition_section_1_quizletvyc0j.pdf
    • http://kidufamipowanot.mywebcommunity.org/pdf_to_word_online_converter_100_free.pdf
    • http://tudejeseruleku.iblogger.org/describing_charts_vocabulary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mivokozibu/16491710404.pdf
    • https://s3.amazonaws.com/bezegoluzose/book_google_drive.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_f56a2b87440a4837a8c59b8a0e4b5cc2.pdf?index=true
    • https://s3.amazonaws.com/jugobimuraje/31841801106.pdf
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_0fd271cf7a614c0e891c7964c507f27d.pdf?index=true
    • https://s3.amazonaws.com/kefefetafij/division_of_decimals_with_models_worksheet.pdf
    • http://sepusuvom.epizy.com/6_man_tent_with_fitted_groundsheet.pdf
    • http://meluromotav.rf.gd/big_file_example.pdf
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_496b2aadca4041f38fc626e63615a19d.pdf?index=true
    • https://s3.amazonaws.com/fojaxexino/28892211190.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_3a25673b07e0422a808a612484cc1096.pdf?index=true
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_ce0484853c3d4317875460da46267395.pdf?index=true
    • http://xaxotuk.epizy.com/streamline_english_connections_workbook_b.pdf
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_2c03063db50e4321aee81bbe06dfe756.pdf?index=true
    • 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_off0000f102.bin
3dbd98504bbf895aa4e9e07c29441b5f839c1e60621796a604fd52e73b5c3b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5696 bytes
font_01_sfnt_off00010480.bin
236f8998aab8aacd2141513aa47a0b8629f2609e1e0c73d44b8e4ef9452dfdfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 11340 bytes

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