Malicious PDF — malware analysis report

Static analysis result for SHA-256 62886319ebc155a6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 19:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9689181335b2068f9e0cfc8a1b8608f SHA-1: 6374a068842b5474115db3f28fb3840601b642b3 SHA-256: 62886319ebc155a63bf02dbdffdd386687d037617952904e90e756f780692636
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically pointing to a 'portal office 365 teams login' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing. The embedded JavaScript is likely responsible for redirecting the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=portal+office+365+teams+login PDF link annotation
    • https://psychotherapie-coeppicus.ch/userfiles/files/20162520709.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/dogute.pdfIn PDF document text
    • https://mkart.it/uploads/file/tisukibesonutifepa.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/37734012219.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/jesixox.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/71916735653.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/86154592332.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be24a9f21---29512497863.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/nuturikugedimel.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/49089765059.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/fegisuro.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/defebuxumemutasimi.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/pusujuvoju.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/93633161290.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vewatudedufebomavinosefo.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/sedupesewilibixig.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/95687715715.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-13/20210913165212958086.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/78315697943.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/losulobe.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jowugez.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/79748682222.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bavuwurodorigixefozixa.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/zenavobabewixig.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614179f194524---wojikudaparosonofaza.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19664381304.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 17900 bytes
SHA-256: 4113b24ddfa303af6924a5c032fb1a6e6adaafd446938bbc7be7de4f7a5490fa
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 11152 bytes
SHA-256: 53c082c298ebaec54a950f3d8f60caf27c3a56e25a3aef43bda06f627a226f84
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1