Malicious PDF — malware analysis report

Static analysis result for SHA-256 3258b639dbfb0a5b…

MALICIOUS

PDF

74.8 KB Created: 2021-04-25 15:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c16f336cee74921aded607746ec0ff03 SHA-1: 8533285cf62d40b94015a8eaedb3fb78ffc1bf62 SHA-256: 3258b639dbfb0a5bdb596cc71eeccfc68bb66f1228fab93c77b20b8f38b76245
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=courts+of+heaven+by+robert+henderson+season+3 PDF link annotation
    • https://sajamokof.weebly.com/uploads/1/3/4/5/134599006/4489975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fdbc4f1624fc.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/dabdf874dba.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/51805704298.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/5610574.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/88556142617.pdfIn PDF document text
    • http://thedopemarketing.com/the_road_pinoy_movie_reviewi3jwx.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/witusedukijire_kigofuvuwakulik.pdfIn PDF document text
    • http://texno3ua.com/vifife1a4dm.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/nevutowarutow.pdfIn PDF document text
    • https://febotagi.weebly.com/uploads/1/3/4/7/134728548/8420767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044fc5c8df43.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/c49b8790-e38c-4e07-84bb-d0941ebba1c9/malibu_landscape_lighting_led_replacement_bulbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddb5dbe-8442-4636-83e6-6d402facdcc7/96163918611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97856152-73fe-46a3-b4c0-93b23f454c33/how_to_improve_instructional_strategies.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/noun_clause_worksheet_with_answers.pdfIn PDF document text
    • http://kageditivumimor.onlinewebshop.net/endosperm_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8329abb-6956-4a4d-a023-730136769119/what_is_dunkin_energy_cold_brew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf56e3b-e7d0-4bb4-ac2b-a14612e5cbce/38980998335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfe1784-d61d-4177-b8e8-1743a274b176/30480840999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a7e969-c2ef-4bca-91ff-8a5c60021b71/37667146797.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 5332 bytes
SHA-256: 1b4555fb6f0e28a0adfde03f3cf15f0d3fe6c4a23deb2ec998186691da89fe55
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10476 bytes
SHA-256: 69112e31c48f48fc055a7352dbbd04b97ef249c96d29a9c614cce18b1fb25dce