Malicious PDF — malware analysis report

Static analysis result for SHA-256 60495ce3ade6b33c…

MALICIOUS

PDF

85.1 KB Created: 2021-04-06 14:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9748e9a314eb786364bb4949a272af53 SHA-1: 3cecf23c322c07f4ac3f6864cf35e3fd706e2c6b SHA-256: 60495ce3ade6b33cb7f224d7461b749da394201fb3acea47bc34bf47b63caa27
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting it functions as a link farm. The primary URL, https://vilenefex.ru/strik, is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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=learn+html+and+css+online+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fd1fbefaf8dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6038cb01e896e.pdfIn PDF document text
    • http://vezukugijisepo.scienceontheweb.net/waluxogebage.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/carding_tutorial_espaol.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/1143820.pdfIn PDF document text
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/gizadiwirawugo_zivot_wupawunozewixo_vebofitefevod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6069ee82c57c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5ffaca30f3eee.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/the_night_manager_movie_cast.pdfIn PDF document text
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/2110178.pdfIn PDF document text
    • http://papawugamajube.mygamesonline.org/2020_ags_beers_criteria.pdfIn PDF document text
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/c9551.pdfIn PDF document text
    • http://mibijuzorifif.getenjoyment.net/63706678698.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/zigezow.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/gimogikufuxavukumeze.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/wunujamivagadulemasomiba.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/wozuvafanonom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_601c6f179b703.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/lord_of_the_flies_piggy_name_meaning.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/snake_encyclopedia_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ef9a95ac-6549-4e3d-97a6-3c7efb89def7/63280029352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29802c7d-eda2-4a20-8aac-d9a1bc18c8e4/english_book_store_berlin.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/givokifapewu.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/civil_war_amendments.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/possessive_adjectives_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e406b851-f132-4d4c-8a96-ad12c619009b/10869583573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2dcaaf-1cf8-4a7b-9db4-7d878b035630/vuduresenunof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 4908 bytes
SHA-256: bc4680e3165741da2bd53881779b8fc6aec207d0e9a2ba507d1b63b6064c9863
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 11084 bytes
SHA-256: 1009bf13724918a93d8070ed8d5ce3e121f9f3b06c5b2a8d8936372234e32e9c
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3