Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b9094d7e990b2…

MALICIOUS

PDF

75.3 KB Created: 2021-04-09 08:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c88c1f6ca5fa867d4f71a8c5317774ba SHA-1: 6e6ba717b58531ace0a01553417c24be4c114f96 SHA-256: d16b9094d7e990b2e2f7a8db597fb02ab8a81b18b901856457c5b051468ac20e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=mental+maths+worksheets+for+class+2+cbse+pdf PDF link annotation
    • https://cdn.sqhk.co/fikubife/aZu9cKq/colored_bumper_plates_set.pdfIn PDF document text
    • http://wukosemat.22web.org/ralemonibemupenujotive.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/81189481742.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/computer_hardware_engineer_jobs_in_california.pdfIn PDF document text
    • http://fagilef.getenjoyment.net/donufolonul.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/ieiigig/76995322517.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/tuheUjd/51098303613.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/pdf_capitalismo_e_liberdade.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/fgdhfLe/zombies_defense_mecha_hero_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/nGnWjiV/download_game_typoman_mobile_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/njjYjaB/year_of_the_rabbit_cast_and_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/fjijaha/vocabulary_workshop_level_f_unit_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodefojabotozij.rf.gd/holiday_office_party_flyer_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a1c677-7a53-4737-96d5-890f0ad195cb/fitamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df1b553-6c53-44c2-b5ce-6d0210ade753/munchkin_weighted_straw_cup_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e6b9e9-2bd7-41e9-81f5-b1c1a07014c3/47211102848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf7b1e0-9043-4bec-afee-85b01448025a/what_jobs_are_available_for_art_history_majors.pdfIn PDF document text
    • http://zapofekeba.rf.gd/boxing_bodyweight_workout.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5828 bytes
SHA-256: 4aa532722dd33fa7d46814cb588e6d7c7178e594f9689c8fbeaeb9331867192a
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10700 bytes
SHA-256: a3df95993c5c0e9ac8f9c2cba4a3d0478d907fcd6ff38cda46b04793f36c34a5

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