Malicious PDF — malware analysis report

Static analysis result for SHA-256 9287a81dda6262b1…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 20:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2720e90f1afc1e003d03b71b5cd7e756 SHA-1: d97693a192a93b1dc0428d66d3df3536df55c554 SHA-256: 9287a81dda6262b1e53f773bf543066ac70a17d17b70573905dc4890d65c6515
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter indicates a potential tracking or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent, likely related to phishing or malware delivery.

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://midufefew.ru/123?utm_term=stephen+king+the+stand+miniseries+1994+streaming PDF link annotation
    • http://sallles.ru/battlefield_acupunctureleepm.pdfIn PDF document text
    • https://fukukajapojuj.weebly.com/uploads/1/3/2/8/132815924/4499573.pdfIn PDF document text
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/2272155.pdfIn PDF document text
    • http://ventager.online/free_download_horror_movies_2020jasgw.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/lutemoxuxezotopolam.pdfIn PDF document text
    • http://lnstagramsecurity.net/995599056924dteg.pdfIn PDF document text
    • http://rte-ita.fun/apprendre_italien_gratuitv1p7u.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/descargar_gratis_diccionario_biblicogmrov.pdfIn PDF document text
    • http://byt-upak.ru/mukablcdmx.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/kejuxupisu_juzumamores.pdfIn PDF document text
    • http://helpcontactform.com/hardcoded_game_guidenph53.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/a07bf921-5c29-4a57-a86f-d0a37bc511de/ruvowigalusaxunetogotedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aaa015-34de-41a7-8375-2688e25b58ef/larivopiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f706c50b-1922-4242-9c55-6cf52c3389dc/depilolelutunekefup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ac91f0-7570-4c3a-adf7-455251d58d55/mavinadagasomofagub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3615479f-ce53-41ac-bd19-95541a3e5db1/54848608037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0ea5f1-772c-41e7-875f-5fb5db67f559/how_to_prepare_for_pl_sql_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a836bf5d-8bdf-4185-9316-3c0a2d033e74/99297386011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ec8a3b-a600-411e-a05e-9d5ad008f2f6/which_motherboard_is_suitable_for_i3_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96ee1bb-47bc-482e-9fc6-64ad77cea5ae/tartine_bread_recipe_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d66797b-4e91-4cc4-9d66-406d104fb14a/50093531604.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_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 5804 bytes
SHA-256: 094f165dc65b67d6b8929c35d8c8ce794f6c216af548a659a2e979b874e21582
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 10688 bytes
SHA-256: 809593715d8e3f66ebce3f152465d0d9dd1f5ba8813c62424d088532c22a58ad