Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2778d466385958d…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 16:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2b346519ce541808c1cb811afc92759 SHA-1: cf04bc80c7da7f18dd955af8200275fb36f28ff4 SHA-256: d2778d466385958d1503390d03069f085a2e868ac804a447e19cefbe980e1ec9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://baarspo.ru/strik?utm_term=remington+11-87+serial+number+lookup PDF link annotation
    • http://dasiwujupuna.sportsontheweb.net/arduino_uno_programming_basics.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/hhwgcgQ/war_eternal_rise_of_pharaohs_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/d1ughO4/3d_tennis_game_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tukepola/fhhTjvZ/best_calendar_app_ios_android.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/radio_shack_getting_started_in_electronics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_603e652051fe6.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/gjrhhJm/white_noise_generator_ic.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jjgdihy/mekupokajaxeniralunu.pdfIn PDF document text
    • https://cdn.sqhk.co/petebodok/bqPGnkE/9702425703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_601d7220f2e5c.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/jdhjAia/jumafekifab.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/ibl8jBG/76803237341.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/13248469797.pdfIn PDF document text
    • https://cdn.sqhk.co/rejoxapuzopa/Dibgfjf/marvel_vs_capcom_2_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/4iegfha/jatezamirumozovapevirimu.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/74081483422.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/inter_1st_year_maths_1a_textbook_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6924e4ae-0fcb-4121-b5dc-9e5e877e5053/the_tube_amp_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6c4079-bb5e-4a02-83ed-847315c20940/xewoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9620259-bf09-4054-958f-f80c788b1032/zoreserer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c34cef4-cfee-4734-ba4e-85fd0f29a490/barnett_doa_crossbow_package__4x32_multi-reticle_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d99c11e-b8c8-4114-b1d6-514036d13051/24810319266.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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 5708 bytes
SHA-256: 5a18c8fde4372ebe4f3adfea2d9c59ea8f5c65e4cdf676c1a4055a77ee0bb152
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10416 bytes
SHA-256: c520217c72757de900a2cf1730cbf8a73bd061762616c2a34a49744a19f928a9

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