Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4199fb0d37ce452…

MALICIOUS

PDF

73.9 KB Created: 2021-06-03 19:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8aa03624b289eb9a594131116f1e1fa9 SHA-1: 6a41c8dc20f36932526fb43b9b3d7ff11f98c238 SHA-256: f4199fb0d37ce45240c84b081ef06a1bbb5bea542e5f8de2c8df678d863222a9
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 hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious or ad-heavy sites.

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://smidgel.ru/pbw?utm_term=classical+piano+sheet+music+for+beginners+pdf PDF link annotation
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/metidi.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/xakibopupas.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/kowul-koxakexulig-wozigujafod.pdfIn PDF document text
    • https://mixezefu.weebly.com/uploads/1/3/0/8/130874535/sugowok.pdfIn PDF document text
    • https://nozukevanof.weebly.com/uploads/1/3/5/3/135392293/tovixejutazudi_gewonabamalibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469145/normal_602900d210ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_60479584554ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6022dfc86e4bb.pdfIn PDF document text
    • https://nogefarixuri.weebly.com/uploads/1/3/4/6/134647247/4015063.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/5a244fb0-c022-41f2-9a39-90607b6b2376/adt_cellular_monitoring_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e36b7aa-96be-4987-b7b5-3d91c92b9507/praying_hands_outline_vector.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144449316/what_is_company_law_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfba7b16-ebaf-417c-9823-15578601ad2d/ejercicios_de_acentuacin_de_palabras_agudas.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144424068/super_brawl_universe_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c23acd-2250-499a-8cc5-5ced0a6bb81b/can_i_learn_jiu_jitsu_at_home.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/w/file/fetch/144556302/does_stretching_really_make_you_more_flexible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62efea4d-95b8-4060-8933-2bfd8cc8e423/resumen_de_la_historia_del_diseo_editorial.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/4621147064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3f2356-a7e4-457a-af2d-21cd79936ce8/fipezadoru.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144468150/5452885196.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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 5612 bytes
SHA-256: 1e6f7b455e69df89c4630c4d190fecef140170900576a729ac94f77a9f7ff9c8
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 11036 bytes
SHA-256: 62356c07d3275e5b95f8277beef91562725e8c66d1d31d5fcf27d7d1b6b6c61e