Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0253e5ea0003cc…

MALICIOUS

PDF

77.5 KB Created: 2021-05-25 06:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c3d0eb8be939ddc9be40634bccd27dea SHA-1: f8fd6456a0164b098e7aa6d889d976012a330da2 SHA-256: ad0253e5ea0003cc62c55e2af402f9d6c9819aade68f2d9d4772a3fa30092954
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF's structure are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=futuro+simple+espa%25C3%25B1ol+ejercicios+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393358/normal_600139b2859b5.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/2299716.pdfIn PDF document text
    • https://jagevugabawe.weebly.com/uploads/1/3/4/6/134631244/eb6e48590f.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/a095eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_602d63ad2dbf2.pdfIn PDF document text
    • https://soberoxafig.weebly.com/uploads/1/3/4/3/134319442/6922867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6006d9201a6f5.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/xezagapiwuzokaxus.pdfIn PDF document text
    • https://dusoveri.weebly.com/uploads/1/3/1/0/131070325/bc61c1f78a.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/39cc1085692de.pdfIn PDF document text
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/da584a983.pdfIn PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/xidazop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_604f3627512b0.pdfIn PDF document text
    • https://jugukibe.weebly.com/uploads/1/3/0/7/130740256/e8dff.pdfIn PDF document text
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/nabano.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/pavidetataw.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degagaziv/50927050091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2ae863-d519-43fc-8314-aed7816afc56/nobazupesesexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1453874f-f83f-4373-afe8-27955503e8a7/lg_gs290_unlock_z3x_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5545ac9c-f28e-4e1f-add0-30fd80113354/the_andromeda_strain_1971_full_movie_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f13e50-3ea9-4eb4-8596-ab44ce877ad7/17870210634.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/josuferevifab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea0a5e3-f7aa-4cec-b9d5-257cb05b00cd/how_to_setup_a_netgear_wifi_range_extender_ex2700.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 1944 bytes
SHA-256: 7d8e0cc452d1bf6fc46d54f57d7e1173e2a3137e283d0aabbc6b378a246ccf49
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 5544 bytes
SHA-256: 1fa39da54b71951a786ba5b0288dfb7877cffc23de091eb788edd2b7af59730f
font_02_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 12280 bytes
SHA-256: 77a7e93aa9af77663c657738196f750488e3aab6c780d8b0332f2be8f3a8c5e1