Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7bb6deac9929da…

MALICIOUS

PDF

69.8 KB Created: 2021-06-01 13:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995b31ae7e8b325a310a8e7094081b9d SHA-1: 180b22db5e326072b15d42669c93c69854bccec5 SHA-256: dd7bb6deac9929da9eeb8b7fb6d88404b0e83293ebe385333d1a3b16c53475e5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and the 'utm_term' parameter in one of the URLs point towards a campaign aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/pbw?utm_term=solution+manual+website
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/8024a1b07f373.pdf
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/julijotigi.pdf
    • https://ripixupazina.weebly.com/uploads/1/3/5/3/135343237/8f4781b61e9.pdf
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/vuworebujofa-tiwiv-turunijesapoz-kukiroke.pdf
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/posafo_lizuzu.pdf
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/1083530.pdf
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/7529419.pdf
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/8674747.pdf
    • https://pimobepasad.weebly.com/uploads/1/3/5/3/135347335/kavawirujasowu-zidin-wimaduvoxix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95323956-302a-4eba-b79c-18c793e9e645/vishnu_sahasranamam_lyrics_in_tamil_with_meaning_free_download.pdf
    • https://uploads.strikinglycdn.com/files/128636b8-e1eb-4143-af43-f6ed2cfd11c1/dejopezejimapufaxigabopo.pdf
    • http://nunaruribeg.pbworks.com/f/41160570912.pdf
    • https://uploads.strikinglycdn.com/files/b30e8f57-5529-4865-a64e-811b81eaead0/the_sanford_guide_to_antimicrobial_therapy_2021_free.pdf
    • http://risoxef.pbworks.com/f/revapivoz.pdf
    • http://lijegazoz.pbworks.com/w/file/fetch/144416097/vida_y_muerte_en_la_mara_salvatrucha_characters.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144449694/9912602118.pdf
    • https://uploads.strikinglycdn.com/files/fd14ddc9-2efe-4adf-adef-2c4505f39e7f/company_of_heroes_2_cheats_instant_build.pdf
    • http://pevozowo.pbworks.com/f/nogopobidutibodukufokul.pdf
    • http://gatasulupu.pbworks.com/f/3971532089.pdf
    • http://mefijunov.pbworks.com/f/67665856167.pdf
    • http://mepijewaj.pbworks.com/f/muberusow.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422349/what_to_do_if_you_get_a_cease_and_desist_letter.pdf
    • http://zekodunu.pbworks.com/f/download_any_video_converter_professional_free_full_version.pdf
    • http://jajafad.pbworks.com/w/file/fetch/144420774/gesub.pdf
    • http://zilebunod.pbworks.com/w/file/fetch/144425070/58264658547.pdf
    • https://uploads.strikinglycdn.com/files/ed9193b1-477e-421f-94c2-ddd2ad5d66ba/cuisinart_dcc-3000_coffee_on_demand_coffee_maker.pdf
    • http://vowujepojez.pbworks.com/f/55589154015.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_off0000d313.bin
30e087e29ca4e5186bc934720cac357b688aa63ff5ef988a07879700502730c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 5072 bytes
font_01_sfnt_off0000e450.bin
445d7b269160fce898630791a5b5e45a86493bdf0ae9fbfd7e8192c08c2033cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 10884 bytes

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