Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf691f131ad0b81…

MALICIOUS

PDF

108.2 KB Created: 2021-09-17 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e67f926f5d66c524124092d9ea144cdf SHA-1: a995775eb82743f181a57d7f8278ab0be6cd617f SHA-256: baf691f131ad0b810951395263909c21aa5c7a825b23b9faf82de9904f27156e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a key indicator of the attack's execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ibericadearmerias.com/file/56168109084.pdf In PDF document text
    • https://palet-school.com/files/files/31398649354.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161365444b7f7f---58693894803.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/rutitasepewikuk.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kejiri.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lokuwetananuwoxeremizeb.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/lubon.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/44379111735.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pumetunobuwavadit.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kodurajepobujikakefu.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xabulevuzejopigudejo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/63669104804.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b55202719d141072906e2af66e56947a/figiwijigotelaturerapu.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/21600713625.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57653960878.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/rukejozigovagovoz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/jisujusedizazokekasi.pdfIn PDF document text
    • http://cityfate.com/files/files/75559019800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=words+related+to+curriculumPDF link annotation
    • 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_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 10520 bytes
SHA-256: 581fe6ee9d965bb91d4a34713f31e55414af7c06bf54d0c55a60fdbfd604788a
font_01_sfnt_off00015874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15874 19460 bytes
SHA-256: a72666efda3355226296bb059d79467b5c4fed3689f79b75c6e05587219e59d0
font_02_sfnt_off00018b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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