Malicious PDF — malware analysis report

Static analysis result for SHA-256 4782cebbfd24d42f…

MALICIOUS

PDF

73.4 KB Created: 2021-03-22 16:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4453566de41f2e4f51f5f428974c9332 SHA-1: e8f2cb1e695bf5735d963f7d95430a126ca3f2e7 SHA-256: 4782cebbfd24d42fb10c6b9b2a7144fe7c7d4ec7f981d4f9661aae847cdf93fe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/123?utm_term=letter+of+intent+template PDF link annotation
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/vuwuxunovola_luzalupidotak_wabikofederogu.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/59079031643.pdfIn PDF document text
    • http://forecast.bet/499250559939oviu.pdfIn PDF document text
    • http://alisaborodaenko.design/football_manager_2015_download_maca4n8o.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/best_penny_stock_under_1.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/lidexududere.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/lekur.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/mathematical_statistics_jun_shao_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/937bd870-5388-4db7-9ab3-1cc8edcacb86/rifuxuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7918ec-3c2f-4e05-869e-86e81f5f82fa/rowofiripafes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e35b66-3c8c-41ce-ad03-281e0bbc046c/does_algebra_2_have_an_eoc_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d6124f-5526-4108-872f-574afebf0561/bodipirigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d1b500-39d3-46e6-aa1d-007a223c5155/23192758024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b275920d-d149-4418-af48-cdec187a6893/is_optimism_a_bad_thing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bda8dc-f825-45e1-ae3f-6c13e3deaff1/sap_wm_jobs_in_dubai.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_ed28e35461b0446e9cd577430f5cc162.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b863cb4-5e81-499b-8320-fdd47ae070fd/how_to_get_drivers_license_without_road_test.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_d6bd13fbe4b94fc3ba50d2ec79a5149c.pdf?index=trueIn PDF document text
    • http://sipanokule.onlinewebshop.net/65125716624.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_011eb7c3a1e74160843300612d745b3d.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_5e95d339db69431e8a5502f2a0caaa57.pdf?index=trueIn 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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 4812 bytes
SHA-256: 62030f8c7cca7b05843fb80c29f825dbcb9e7deb7436409509f85f17ef9b9213
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 11264 bytes
SHA-256: cd7f2e6c199bb5acd92017174c01dc782d219df492d3e57bfc01b311a0c96bf4