Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b19b677553bdaa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 03:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16dc2c7e51e6b779f41b83fd50e8b5b5 SHA-1: f4b4120d6b3ce7cd660c8f0f714133b6a6785393 SHA-256: 70b19b677553bdaa782f9e057e1354b184ed9a71686f7689b2f59a3bcad5964b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, suggesting it acts as a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score support the assessment of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=mobile+legends+injector+skin PDF link annotation
    • http://inruho.ru/ckfinder/userfiles/files/36814249926.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/38283077748.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/dekumimukiku.pdfIn PDF document text
    • http://co-mit.com/uploads/files/bexudubefemipube.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/84428617982.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gikulenuko.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///judipuxuv.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/nezipok.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630892046_33308c6a76.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210910075902.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210909225350.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/34066568867.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/lanavarusab.pdfIn PDF document text
    • http://mutitar.com/user_img/files/30739475856.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/tulomexexekogowikev.pdfIn PDF document text
    • https://slide-bearing.com/d/files/babazanajipifujulusuwita.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_085BAEE7D8DD768D.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/xutavugiridifuxe.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/kusiranaxawa.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/gowemitezi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lefogemulame.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ade35d6c3---74320269151.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/78676858740.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4d9abb64add5904efae53f691ff4a7f2/vagutilogamobatep.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 17704 bytes
SHA-256: 0e5d4cab4b6e74544fe6fd002457b342f0ae68e7ce3c23eaa6e4ace3db2d7edc
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10736 bytes
SHA-256: b60bef23380f71ac005b759c3d321f6bc68eb89045c8908342772d7399d1a2fc

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