Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0788faff87f41a…

MALICIOUS

PDF

87.2 KB Created: 2021-03-27 16:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f5f4ab48f172cd26e3f3259e9324b51 SHA-1: 7cf619c4f593aed9a76201bc37a79032dfc2aec3 SHA-256: 8f0788faff87f41a0162f4ddb10eec12096c3b0476b591759b1c734622faf76c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body appears to be a search query, likely a lure to encourage clicks on these external links.

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://nipisod.ru/strik?utm_term=how+to+get+marriage+certificate+in+bc PDF link annotation
    • http://zebisol.mypressonline.com/antonio_gramsci_cultural_hegemony.pdfIn PDF document text
    • http://ekzo-fruit.ru/bravos_xl_washer_f5_codei2jsx.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/balanopostite_tratamento.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/firma_de_los_acuerdos_de_paz_en_guatemala.pdfIn PDF document text
    • http://mowilobo.22web.org/duvakagomufoxaxofap.pdfIn PDF document text
    • http://kafojiv.iblogger.org/12082157067.pdfIn PDF document text
    • http://instacopyrightcenter.com/how_to_clean_print_head_on_epson_workforce_wf-26307l2za.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/vitamix_5200_blender_sale.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/supply_chain_management_book_by_sunil_chopra_download_free.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/36408957910.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/cbbbed7a-2e50-473e-9ae1-7dcadebc9c08/mavomo.pdfIn PDF document text
    • http://setiwol.epizy.com/free_templates_for_hotel_management_system.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/tusoxezagilabibiwajinoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a694ea-335c-4b33-8909-d0c9bb9d6554/organic_chemistry_reactions_practice_worksheet.pdfIn PDF document text
    • http://fotiworoz.epizy.com/74945536493.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/the_architecture_of_computer_hardware_systems_software_and_networking.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/bumuwatujuvuxegu.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/38750156746.pdfIn PDF document text
    • http://tofezaniv.rf.gd/drugs_acting_on_autonomic_nervous_system_medicinal_chemistry.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/el_desafo_del_amor_40_das_pelcula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45efa32-3d6e-4d21-9323-98c1edcf42ed/zaxufakefoxekogofikupuw.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_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 5184 bytes
SHA-256: bde0bddf7b48e3a98ba281f6e462dd169fa4b4fe235f3f86e6a720766e17d582
font_01_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 10832 bytes
SHA-256: f1bbcbbecbf239a023c0439bf1a15d82097d4a743094a899059cf9b02a861ff6

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