Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412848d2d4b9b4e…

MALICIOUS

PDF

70.7 KB Created: 2021-06-01 13:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f83f0831ce35c4f5f72754f56c45d1 SHA-1: dec9b255ee7a808008efd29e668042cb3a07e4fb SHA-256: c412848d2d4b9b4e46a78ae577d34ca5831b72eaf88802d5d7bc70c2779d9940
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=osmanl%25C4%25B1+padi%25C5%259Fahlar%25C4%25B1+kitap+pdf
    • https://mugezumaz.weebly.com/uploads/1/3/4/4/134401185/5901630.pdf
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/mibagelilip.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/1967918.pdf
    • https://kisoxorojapaga.weebly.com/uploads/1/3/7/5/137512046/df7fed3fccf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://betosaxugawi.pbworks.com/w/file/fetch/144450621/descargar_120_dias_de_sodoma_pelicula_espaol_latino.pdf
    • https://uploads.strikinglycdn.com/files/03b25a79-24dc-432a-b599-ab5d32875361/lajupovedawujixuf.pdf
    • http://lipadune.pbworks.com/w/file/fetch/144414207/rofosibakiwejojidopuwa.pdf
    • http://jajafad.pbworks.com/w/file/fetch/144423369/bekhayali_song_free_download_kabir_singh.pdf
    • https://uploads.strikinglycdn.com/files/5f77170f-3ec1-45af-99eb-5276eaf273bf/kenmore_ultra_wash_quiet_guard_filter_cleaning.pdf
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144421125/can_we_convert_2d_to_3d_in_autocad.pdf
    • http://gosirata.pbworks.com/w/file/fetch/144455529/sivaji_the_boss_full_movie_in_hindi_free_download_300mb.pdf
    • http://bofamawetodo.pbworks.com/w/file/fetch/144440193/35933758335.pdf
    • http://gajufabeke.pbworks.com/w/file/fetch/144423018/how_do_i_name_my_real_estate_business.pdf
    • http://pamotekegopa.pbworks.com/f/35446960709.pdf
    • http://didaneguk.pbworks.com/f/wipobogofutamuxelulunebip.pdf
    • https://uploads.strikinglycdn.com/files/62f68e11-9e1f-4a82-be81-e4c4eff4e072/popubisudajasutorafejijuk.pdf
    • http://mepijewaj.pbworks.com/f/sirisuwip.pdf
    • http://kolasotosexu.pbworks.com/w/file/fetch/144414162/what_is_an_hoa_letter.pdf
    • http://masawumel.pbworks.com/w/file/fetch/144420309/composicion_del_aire_alveolar_y_atmosferico.pdf
    • http://letonepamusi.pbworks.com/f/37767552877.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_off0000d8ca.bin
6d2367bdd15693ccee3f10459abc1c2f3511283c5c0007c13068ee09eb7c266e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 5652 bytes
font_01_sfnt_off0000eb4f.bin
6d47fda784d3f86fab95850b8211044c1b7140e8a638e8f975f35c8e0482cc3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10024 bytes

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