Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c41c24e239fc9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 18:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 37b6d7a8e50a9ee92ae9464b0eb8ec9c SHA-1: ddf39ef83d1de5498b3e593187fd7e194630a234 SHA-256: bd5c41c24e239fc985513817343031055e977bd5019b32c4ea7ec407e20e8ee0
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+many+amps+does+a+minn+kota+55+draw PDF link annotation
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/c0877e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_6030095e1877f.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/wukumikal_salibo_kopududavekar.pdfIn PDF document text
    • https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/551f20e4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_60305023a9a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5fd0ee4e3f532.pdfIn PDF document text
    • http://aires.fun/azure_database_migration_service_guidevqci8.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/a7110c51640e1df.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/16247231905.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/neluvipixijiwafokima.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/how_to_play_japanese_mahjonglmujx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_605392c063136.pdfIn PDF document text
    • http://kprovk.xyz/negenivopetabosoqhj62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6046b2651b4ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/whats_coming_to_disney_world_in_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25ad2af-13b7-4f30-8612-bf3426889bc8/88224208057.pdfIn PDF document text
    • http://sizikukot.epizy.com/16251672199.pdfIn PDF document text
    • http://naxakise.epizy.com/12691906880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a15906d-ca0f-4958-8fdc-307013d6d512/34951467235.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/pejuwajarete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcaa8b8b-dd81-4780-a3d7-8d2c0d3512da/61809684911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3f95ca-e72a-44db-a78c-67e32a314c49/what_questions_should_i_ask_a_marriage_counselor.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 5416 bytes
SHA-256: b0c24fb83113cf4566469ea0cdd1791f2be5cba19b916b72b9bbc1eecea97fcc
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 11064 bytes
SHA-256: f44471bedaf9d3e2bb162052a5cd468e1a602aefba44b526240fe174b9571a77