Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ac4b0f40296ea…

MALICIOUS

PDF

68.5 KB Created: 2021-03-13 22:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 887e2aae9ff9d49f312d442cf677626c SHA-1: ed3053af9f1ad12e3e2ae1ff3424a9422f75bf74 SHA-256: 9b7ac4b0f40296ea443371468164812b92fff18aac118bd39e521607296563b9
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, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further malware.

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://jottigo.ru/strik?utm_term=eureka+the+boss+mighty+mite+vacuum+bags PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383471/normal_603d337cb2555.pdfIn PDF document text
    • http://trackengine.host/certified_analytics_professional_study_guide6j83d.pdfIn PDF document text
    • http://otomail.business/gta_5_psp_download_file4zuza.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/bc61182474b7.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/899504.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/5738641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fe9069aef538.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/zefinokefejazokapatu.pdfIn PDF document text
    • http://fb-ig-violation.com/wijegit4a193.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/1502338.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/jutaseju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_6040ae85ca139.pdfIn PDF document text
    • https://rifewageza.weebly.com/uploads/1/3/5/3/135349229/6046730.pdfIn PDF document text
    • http://instapodarok365.site/what_is_meant_by_power_dissipationmgxjn.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/81d2f0db-dfc1-4845-b9a3-51044abbe7c7/ferinok.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/14695518392.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/66980594024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac96f87d-87a4-404a-87d1-1034b55fb71f/database_management_certificate_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d123252-0139-457b-91dd-ff726ff07938/what_were_the_provisions_of_the_radical_republicans_reconstruction_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3867c8-b7e5-4303-9bd3-8ae040bb3bf2/dakeve.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/jakotifuxik.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5504 bytes
SHA-256: 7732e24026ba7616087bcd47b364d2b8f7e3b6ed58a66441db80e522da3b379b
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 10112 bytes
SHA-256: d22d9d7292dc076519364b88f9928f8552cadc7de49ed7d8e0f6547db2e2c848