Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ff778990c8a22b…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 09:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0b0a2ede20be470acf87015fea01f862 SHA-1: 2554f92d9bfe82772dc99e481a03fb9f56ef945c SHA-256: 50ff778990c8a22be297a6e4d2ed221d5f74ce695586824edc01db4287d6d830
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The PDF's structure and the presence of embedded URLs suggest it's used as a lure to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=what%2527s+the+difference+between+snark+tuners PDF link annotation
    • https://cdn.sqhk.co/nudabesawi/OjeHdji/tabobekodugepobowepen.pdfIn PDF document text
    • http://bufo.online/free_online_slideshow_maker_with_music_no_downloadudrra.pdfIn PDF document text
    • http://carluxepaint.site/trivial_poursuite_en_ligneg6egy.pdfIn PDF document text
    • http://btsworld.org/odyssey_fagles_full_text7syuz.pdfIn PDF document text
    • http://1freedom.space/high_yield_topics_surgery_shelf26dy7.pdfIn PDF document text
    • http://lotsmen.com/puzidajapadun3ekkh.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/fhdjbja/rescue_wings_full_apk.pdfIn PDF document text
    • http://gatorama.fun/ledawefesatoz77f2l.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/ichdjeH/81890255168.pdfIn PDF document text
    • http://avit0.pro/descargar_el_dador_de_sueos_bruce_wilkinson_gratisnwwer.pdfIn PDF document text
    • http://infonewstravel.com/bollywood_quiz_questions9o9i8.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hbijhjj/offline_advanced_english_dictionary_app.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/personal_statement_for_job_application.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/30914515157.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/62832358166.pdfIn PDF document text
    • http://luchdobro.site/magic_mouse_2_space_grey_reviewwjvyc.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/gdhmMoN/bojub.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/rhfhagi/66834118630.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/cjdhfAc/rujak.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/iighjfS/11286289470.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/athletic_apparel_industry_overview.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/callan_method_book_4.pdfIn PDF document text
    • http://erogan24.website/pop_instrumental_beatsdig10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zenakezogutomu.onlinewebshop.net/wisiwuta.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/consonant_blends_worksheets_for_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5192 bytes
SHA-256: 42581892cf1100f6058edb009f914c45819944d571690dc841d27675bc502e1f
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10660 bytes
SHA-256: 42becce5a32ff2e055402c6c7d20a267a40855d91ca21b3fc1ff920a0feb5380
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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