Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc025bb6cc17ffb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 13:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a854365d1514b73141bcf72e670b1f0e SHA-1: 7929d2d2a88beacaa4ac6b59ffdf73ecb5331cd3 SHA-256: ebc025bb6cc17ffb8ce1e6a2aa11c5a2ecb7691f2e86d8cc1c4409e22b58d315
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+transfer+files+onto+sd+card+android PDF link annotation
    • https://codecs.ro/images/file/kupuk.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jazawivotodaxoxasat.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72939875718.pdfIn PDF document text
    • https://kinohorror.com/upload/file/tonabebeb.pdfIn PDF document text
    • http://poultech.net/d/files/jiwirabirabulazemu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99c89dc40bf7e4c4d32d937828b61823/depagavobugemoza.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/pogezugiwutusanaxekebiwi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///goxiwizawokodiwida.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/43399355152.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/6307685268.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/venixixuzemutalomekezari.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/vasamezifog.pdfIn PDF document text
    • http://jcpingie.be/public/files/mokagojo.pdfIn PDF document text
    • https://eniedu.com/data/file/20210910060620.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/petomirevobovigigabubuges.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/51901998577.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/91205742611.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/selesawuvagol.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/gavukiwi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/37638455366.pdfIn PDF document text
    • http://hijoin.hu/editor_up/7328710499.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/74362020703.pdfIn PDF document text
    • http://dentherapia.hu/files/file/21000471710.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_off0000b087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB087 10548 bytes
SHA-256: 584d9a441e332caac23ab26a0c46e3749938e68425a4dce6cf0d3374efae0a2a
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 15900 bytes
SHA-256: 730cba1fd04b5d3fdb0184ef074e1a4991f26f5f0e6900f56c2fbe3f03032abb

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