Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f38789f18edca9…

MALICIOUS

PDF

89.1 KB Created: 2021-03-29 19:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42664ad0633b78a588b458c7a1023032 SHA-1: dd5812f926e92746f313e401a7ba3b04f6f480c6 SHA-256: 21f38789f18edca9847869a66ce1ee17944f672a9c773c2e7a02b05a049bbb77
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, with the ClamAV detection name indicating it's a phishing trojan. The PDF contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://zajinet.ru/strik?utm_term=asp.net+core+3.0+mvc+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/kagurase/DhiIhgd/lamakibe.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9sSlRvh/download_knight_td_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/simumufij/bgjhg5D/slang_word_catfish.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • http://wigisosidika.22web.org/kaweli.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/aihKhj0/water_slides_for_swimming_pools_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/cQ3ijjh/computer_launcher_for_win_10_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/HGRjcie/54404480946.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/jgoiagf/top_up_saldo_driver_gojek_via_bca_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/ipJflhe/tenuzezugepifaru.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/Jhcgijj/last_event_at_tpc_boston.pdfIn PDF document text
    • https://cdn.sqhk.co/nejuvudojo/fI1YhcH/62182465752.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/iDhjBia/xegowusiginebazexiziwin.pdfIn PDF document text
    • http://pisazujinatef.iblogger.org/neet_biology_books_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/ihphmgj/8840890740.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.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/gimufesajo/jovorozaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/buwirepuxiwipenelo.pdfIn PDF document text
    • http://didaledagaxuz.rf.gd/galenabixuwojujugiwiresi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/vodavadotujaxixosurimot.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/solucionario_mecanica_vectorial_para_ingenieros_estatica_8_edicion_beer.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/pudemejive.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/lewozepig.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/denig.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/comcast_stockton_ca_channel_guide.pdfIn PDF document text
    • http://puxagere.epizy.com/biophilic_urbanism.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/invoice_format_cdr_file.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/edexcel_gcse_pe_revision_guide_online.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_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 5688 bytes
SHA-256: a8538ad84344f9dd2d1ceb273b06c3f62724d8c18b215511d50206dbe2881236
font_01_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 12096 bytes
SHA-256: 8102ffe1cdfa93e3e032fe197b5a8547d1fe78a08e81f90b570030882dbc5d33

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