Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6af1674fd46552…

MALICIOUS

PDF

73.7 KB Created: 2021-03-27 14:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f977b175be0e96a68bdb0369276665 SHA-1: 7998497c4d4c6c92c8dc3cfc6e88ca7dc3ec20c8 SHA-256: 7f6af1674fd4655254d22600be3c32d968e7291b651b2cfd51e2c3dd44a88615
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one pointing to 'https://kuzutuzo.ru/award?keyword=daf+adjektivdeklination+%25C3%25BCbungen+pdf', suggesting a lure to a malicious site. The document body, though heavily obfuscated, appears to be a disguised attempt to present search-like content to the user. The presence of embedded URLs and the link farm heuristic further support the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=daf+adjektivdeklination+%25C3%25BCbungen+pdf
    • http://kismyketio.com/fosanaxugudowvpm0.pdf
    • http://mizejodaf.mywebcommunity.org/direito_penal_cezar_bitencourt.pdf
    • http://winatesef.sportsontheweb.net/carl_gustav_jung_arquetipos_e_inconsciente_colectivo.pdf
    • http://rotawafuwuno.scienceontheweb.net/glencoe_science_chemistry_matter_and_change_textbook.pdf
    • http://zapazereti.22web.org/928019989.pdf
    • http://lumogodasekepi.mypressonline.com/does_roomba_980_have_imprint_smart_mapping.pdf
    • https://rawabupabazokiz.weebly.com/uploads/1/3/2/6/132695668/8060901.pdf
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/bd8cd911546.pdf
    • http://aviabileti.ru/vasoluraoo98a.pdf
    • http://gedirobidepud.scienceontheweb.net/91359372053.pdf
    • http://riwalimuj.scienceontheweb.net/aflatoxinas_en_cerdos.pdf
    • http://lorozetuwivu.medianewsonline.com/what_is_an_acknowledgement_of_paternity.pdf
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/5177314.pdf
    • http://siwivelijutore.medianewsonline.com/ninonodajas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_c97df3101db54c42b47a75f46cc733b6.pdf?index=true
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_9364f045bc03466e95df75075054d682.pdf?index=true
    • http://xekuvazam.rf.gd/thermal_insulation_sheet_home_depot.pdf
    • http://novogizeboje.myartsonline.com/budapest_tour_guide.pdf
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_93c66e8d9927407eb3693e699b5a0d1a.pdf?index=true
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_f072430232384b4c874a1a9a4f29792e.pdf?index=true
    • http://wojibikifi.myartsonline.com/handbook_of_operations_analytics_using_data_envelopment_analysis.pdf
    • 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_off0000dcf1.bin
21605f04bd85f19b83fe0a01539e43f64913ad8c1a8cf7ff058f9c485063fb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 5392 bytes
font_01_sfnt_off0000ef43.bin
6d57c53f21fae21d5fdb383e0e50937053a2cfef6cf9eb93877eb7425c9206c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 12120 bytes

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