Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc55cf621628f12…

MALICIOUS

PDF

82.4 KB Created: 2021-04-03 11:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451e62234da06c1d4712e323c169f22b SHA-1: d886dd2d2738e136477ad8cbd946f19844cb763a SHA-256: ebc55cf621628f12a3d698455b74e68a58ce75023cd904744d76186387616983
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/aws?utm_term=what+day+did+school+end+in+2017
    • http://jovasetiveduza.scienceontheweb.net/37420825564.pdf
    • http://vurejowug.mypressonline.com/the_boy_who_harnessed_the_wind_film_summary.pdf
    • http://rolopigabetitu.scienceontheweb.net/14776569648.pdf
    • https://cdn.sqhk.co/regisanozoxo/hd9jbGl/guns_cars_and_zombies.pdf
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/1e881d40dff9.pdf
    • https://cdn.sqhk.co/tolademapati/amjahan/celestine_prophecy_epub_free.pdf
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/2405540.pdf
    • http://peluxuba.sportsontheweb.net/common_mistakes_in_english_exercises.pdf
    • http://vijoviresole.mywebcommunity.org/gobakasu.pdf
    • https://tabolejujabolo.weebly.com/uploads/1/3/2/6/132682899/besebero.pdf
    • https://cdn.sqhk.co/supesuvepo/ciaFgcb/dabexotafalabiwejerabu.pdf
    • http://fejukoturig.medianewsonline.com/scaramouche_saxo_alto.pdf
    • http://gaxesujite.medianewsonline.com/oxford_phonics_world_4_wb.pdf
    • https://cdn.sqhk.co/vagofedewat/Q3gdEjf/easyjet_flight_release_dates_2020.pdf
    • http://noxavikadovul.mypressonline.com/air_source_heat_pump.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_a3f130f9cc5f4381a9cd2333760cd077.pdf?index=true
    • http://matewedidoxeber.onlinewebshop.net/rewuwekewumifozowita.pdf
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_56402b4ca3734ace8acbf535c14af017.pdf?index=true
    • http://natizuf.onlinewebshop.net/xifovup.pdf
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_92b398f6082144209bd5291700f520fe.pdf?index=true
    • http://jagomizaf.atwebpages.com/canon_elura_100.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_540d078088a84b34ac429f0f66b6fcaf.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55f.bin
40e9b42e31fb46d974ccd996cd35d3092d9df515aa1b683cffba6861c3231c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 5240 bytes
font_01_sfnt_off0001073f.bin
7d1246bb39adc50be4bf985ed9b0def41697d317b9b2ade2cbfea0e15e17ba86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 10912 bytes
font_02_sfnt_off00012cb7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 4324 bytes

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