Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cf8fee39a170ab…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 06:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f42de5d3dc32951360f0cfa316e78aaf SHA-1: ae9d2729e08452afbae5641453ca99e03a30a5d9 SHA-256: c9cf8fee39a170ab9ed484b6d586dff220c60fc8f8a0b1b16f5b00693ead49f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=forming+storming+norming+performing+images PDF link annotation
    • http://fagilef.getenjoyment.net/33329809908.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/jozokabu.pdfIn PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/3872813.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/4654105.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/farmacos_agonistas_alfa_2_adrenergicos.pdfIn PDF document text
    • http://xufikefizot.sportsontheweb.net/ginulebapeposofowolodez.pdfIn PDF document text
    • http://wiinorama.website/92135792320nizc0.pdfIn PDF document text
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/81207bb2507dfc.pdfIn PDF document text
    • http://uscreditmonitoring.info/basketball_offense_against_zone_defensex14gj.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/witigaxudoroboxoxas.pdfIn PDF document text
    • http://cherrypimp.online/the_shack_restaurant_east_lyme_ct_menuou4ch.pdfIn PDF document text
    • http://dvestideyli.xyz/delonghi_oil_heater_timer_not_working060yn.pdfIn PDF document text
    • http://xeniveperovabef.sportsontheweb.net/abzurdah_completo_descargar_gratis.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/lilaguwikoziveberolodut.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/4c49b399-dc16-4174-befb-63d3c5f616f6/48204404349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000a6a6b-b7cc-4175-8ca9-fd7c58ec16f5/msi_n1996_motherboard_drivers_for_windows_10.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/julewemipu.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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5144 bytes
SHA-256: 51363b3279d011b895d0809e01d539b43975abd48ac6f4443bef61c2d3a8780d
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10712 bytes
SHA-256: 768f6017c8e12d4fe415e21ce1e02912dd839c2c076e0cf11f8b02e17b444afa

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