Malicious PDF — malware analysis report

Static analysis result for SHA-256 852e8f0155ecce6d…

MALICIOUS

PDF

94.6 KB Created: 2021-03-31 03:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0f41798416a8aa651abe99b46a66ddd SHA-1: ac7ff5f2eff976caafee947c6d508a79f297b072 SHA-256: 852e8f0155ecce6d1da246c009c480762532fbc075be4c162b2aef009a381e6d
96 Risk Score

Malware Insights

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

The file was classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'kuzutuzo.ru' suggests the document is designed to redirect users to a potentially harmful website. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=reinforcement+worksheet+meaning+in+urdu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375195/normal_602ae42f45925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_60175d8e0f4d9.pdfIn PDF document text
    • http://betmoy57.com/jigogodisojadq0dwm.pdfIn PDF document text
    • http://ihsteam.ru/pinball_pro_football_game_in_y8za5qk.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/bosquejos_de_sermones_expositivos.pdfIn PDF document text
    • http://republvinb.fun/84351866027mhrax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601485c82b76e.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/zotewotubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5fec99e3c0aff.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/29109686965.pdfIn PDF document text
    • http://alphabitx.com/50222851933nw5o7.pdfIn PDF document text
    • http://in-arenas.com/zupopubuzg1o9s.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/17568597107.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/15025069028.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/what_does_the_phrase_you_missed_the_boat_mean.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/fajetufekejo/sekasabuveji.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/check_excel_spreadsheet_for_macros.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/super_mario_3d_land_4-5_star_coins.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_bac2545f62a5442a951d914831a9d742.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/words_that_start_with_phone.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_8dda297fbb184027a160b4da538a7d10.pdf?index=trueIn PDF document text
    • http://wusozupit.myartsonline.com/obc_caste_list_in_up.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/marketing_operations_specialist_interview_questions_and_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14272 22972 bytes
SHA-256: 5da80b9b6aa55163a3926a027bb63254f2fc86040622a5c868da6bd1e76b4643
font_00_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 5564 bytes
SHA-256: b16bc13eef6e4ab9958aea311e177634db51e6ff101e1a577caac616fedcc9af
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 11304 bytes
SHA-256: ecadc3c7acbd47a6edf2ac9332a8bd1b4238dff752de7e7275612951c14b4772

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