Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73231c8547f181e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 21:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3cbf68ef7908dc3791bbdfcb9a6c14bc SHA-1: daf189a51aa40e6018185d7fca502f98a7c702f0 SHA-256: b73231c8547f181ef34c3b7fd709ecdf579a834885bc15d5d379a080774f8189
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain keywords related to search queries, reinforcing the lure aspect. The primary attack pattern involves redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=does+dish+have+hd+channels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424330/normal_60120ca33d465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60142a4484340.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/kamelobum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_6006a5445a6ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5feb564e78402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_604441174ab6a.pdfIn PDF document text
    • http://deflecfcvy.best/22145869204lxqpq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5ffd64f9a0f4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_6006b89844aa0.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/introducing_second_language_acquisition_perspectives_and_practices87ryv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_60164b0112d75.pdfIn PDF document text
    • http://sodaapp.club/993793683ievdn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd0efdabf082.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/vexeliwojakum_sewadajenejejap_gefeboridikakab_pisuvivubupuram.pdfIn PDF document text
    • http://helpcopyright-service.com/essential_cell_biology_3rd_edition_free_downloadp4z8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5fdffd6bd8f79.pdfIn PDF document text
    • http://lighttravel-ng.com/tuesdays_with_morrie_ch_1_summary20bre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_601b6c5b1641f.pdfIn PDF document text
    • https://pegitizikaze.weebly.com/uploads/1/3/4/7/134730703/fawabozinodelakaride.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/5f5b3891-14bb-4f7d-89b8-43e2f0aae1bf/zekuletevizewuxevorepuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1dbe82-9357-4abd-bbf3-5e00390b4b49/windows_server_2012_r2_datacenter_product_key_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41649709-2bc3-4a1b-a8a4-54f9c13d1492/every_living_creature_on_earth_dies_alone_tattoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb68bfbd-bf73-4231-be2e-727202b6515c/acer_aspire_v5-572p-6454_touch_screen_replacement.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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 4988 bytes
SHA-256: 4ba346bfbc55a7db25a859a4be8e752889d75c2bcb0bdc720076a9926ec52e43
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10440 bytes
SHA-256: 14c83894a3f7bf4098c75ddae9a47958e9222ad0ef10d1633a7a46281a9f210a