Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec082912b14f0b8…

MALICIOUS

PDF

76.8 KB Created: 2021-05-27 21:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ab8039a8167ad69c8b24c48361f7df53 SHA-1: 2ec24d91c4bd446b7bebf5017e29660f3896e3c6 SHA-256: 7ec082912b14f0b84a993d30ad3665aa51fc17c3bf9552b3f43043ccbf44df63
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 functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://vilenefex.ru/strik?utm_term=what+is+tropical+smoothie+energizer+made+of. The document's structure and the presence of many links suggest an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+is+tropical+smoothie+energizer+made+of PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500201/normal_60625a3fb9713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_6036cc4c8d6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_603435cd6e807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fc7007ab9ce9.pdfIn PDF document text
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/8254726.pdfIn PDF document text
    • https://bagukewedofitaf.weebly.com/uploads/1/3/4/5/134507185/fekogabemuj_xolinoti_kojezox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fd95bae9648f.pdfIn PDF document text
    • https://fuvuliles.weebly.com/uploads/1/3/4/9/134904701/xokupuvaferuzaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6027b08b0bff8.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/mirifaxenan.pdfIn PDF document text
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/noxezofazaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6033fe9baaf07.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/4e002927-8116-4713-9fa9-3783854dd3ba/36460941728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49f71fc-17fe-4acb-bb55-d1ac79a3bdeb/23199184429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a0e1b9-44e2-44f4-a384-73f5af4b1491/sisanoliwijewot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c9a03f-9675-4767-a4bb-cacc50be1670/ridgeway_grandfather_clock_time_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afe3f33-f37b-40f8-b8f6-24d78fd3b4eb/sql_tutorialspoint_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f6b6e5-9229-4faf-bed2-3544d546d5d0/dosebegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0390afe5-1d5a-47bc-b321-d87d88f24416/mirijavit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca830ae-850c-4c76-8b4e-c42b6f94ce58/32466335732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccee4b3-a950-43df-b736-8f52ac415820/fobasevalepuw.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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5632 bytes
SHA-256: bf875f883f23b0e814fab568c77d28245f623f028d525d13f67ac2350b317f1c
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10876 bytes
SHA-256: f4c559db7b4a64f5df8671562fb5486b15406fbd083329841f9f50e2d8f90a63