Malicious PDF — malware analysis report

Static analysis result for SHA-256 2744b02745524d8c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 12:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42ce721435697155e8e88750ce32f303 SHA-1: bd17c88bd73e60d383a1585c629ac91ef2ae8b50 SHA-256: 2744b02745524d8c565b41c696aeba5a3e08f6b6fc72198bde2c595d7ee07fef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mecateengenharia.com.br/ckfinder/userfiles/files/mibebanexewawesetagu.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/kejesowubew.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/11706824491.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76219883468.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jiwedavixixibepixiporuje.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/gidewapofulonesat.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/852242a419b9800a12e6b7f0aa2c217b/vitenerapirafobilotokemi.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/95334311580.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021914110288975.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mexufizurimukezerativod.pdfIn PDF document text
    • http://it-hair.com/userfiles/97489227840.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/14805612320.pdfIn PDF document text
    • http://finchamauto.com/pics/terevuda.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/67062736285.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/16329272592.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/nanosizixuzem.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19163813347.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/potasopovebanomux.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/52934611369.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/dajeduvasib.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tewiralopululopeji.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/sokezanamos.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/padoxadigizurawutikasik.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be546e7f32---gularozonetemijaxiw.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/bikozijojidok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vantagens+de+fazer+root+no+androidPDF 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_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 16500 bytes
SHA-256: f9912fb5ad966347f2725298b37eb360961441329a9a091f293b78577c4afe2e
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10512 bytes
SHA-256: ce31e7c6cdd207eb93a5ea8f007a8e402ec136b977170dc1b85f325415ad9141
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1