Malicious PDF — malware analysis report

Static analysis result for SHA-256 79610e44f94e5f85…

MALICIOUS

PDF

75.8 KB Created: 2021-04-08 01:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23e23cc9d8ea7461de294eceb49bb7c3 SHA-1: 222bc47f7802e90dd53d79ccc13f6c835785358f SHA-256: 79610e44f94e5f858c67afa5836f3ab58f2518956f57afa4261cf45b7d032ac9
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 hosted on disposable domains, suggesting a link farm or phishing operation. One of the primary URLs extracted is https://mezovuduw.ru/strik, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=toro+recycler+22+190cc+spark+plug PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490133/normal_6041b29c5f1b6.pdfIn PDF document text
    • http://xuxogez.22web.org/the_coconut_song_piano_sheet.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/rorogevemekegolulus.pdfIn PDF document text
    • http://mapebudo.getenjoyment.net/accounts_payable_procedures.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/xujunerave.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/tiwasuweguxusekop.pdfIn PDF document text
    • https://vusuzawemuli.weebly.com/uploads/1/3/0/7/130775102/talokekino.pdfIn PDF document text
    • https://bigasena.weebly.com/uploads/1/3/4/7/134725946/421819.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/kawepofedaniv.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/4cbb59bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601ddb1cdffe1.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/3487729.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/kefasopora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_5fda7644555e0.pdfIn PDF document text
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/kuduva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5feeb35725a37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_d8094d74e4164514bc183e986831532a.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_28b315d0a0aa4cfe889933cb06517297.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_d7596badb2664413b0abc3b871ff6a10.pdf?index=trueIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/zodemutizes.pdfIn PDF document text
    • http://julexobe.rf.gd/laporan_pendahuluan_bblr.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_dd99a8117a6c450bab727cdee167d538.pdf?index=trueIn 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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5696 bytes
SHA-256: 34edad4ca3fd173dba1b374028490e8fe35f162fe792870b258307ce9c15d1e0
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10376 bytes
SHA-256: 9eae6667b7a43c05ed693583495a608676c0240e81bf7210616a74313dbd905c