Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b0ba3ae911123…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 22:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d8a716398ce95cc8b8f4c02406a1521 SHA-1: 0dce0aedaca4848321b85276004a3e2ebf7199e7 SHA-256: bc9b0ba3ae91112392f0ae34f75f2add06c8f8c1278ff740e35020d184ebb1ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pixomot.ru/uplcv?utm_term=watch+new+wonder+woman PDF link annotation
    • http://uro-medical.pl/zdjecia/fotki/file/bajetikotenasikejorofuxet.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/duxulujiwafadefunuda.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/jejalezegenip.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/77545721807.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/87148310815.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/78656829309.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/90086772111.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kurafegunopivozuvuke.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/23853906628.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/76994570439.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/31376232238.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/pefesibizotumozuxiz.pdfIn PDF document text
    • http://usateatop.com/_upload/files/90353340486.pdfIn PDF document text
    • http://pololanna.com/user_img/files/68468313772.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6d386691---12153610280.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/65048494951.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/25248406597.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gidoliwujidexuguzeran.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/8442920283.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/59703922614.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2753248321.pdfIn PDF document text
    • https://grnca.org/img/files/files/pelapirikuvofemodisuwise.pdfIn PDF document text
    • http://yilip.net/userData/board/file/33446897397.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/fijif.pdfIn PDF document text
    • https://egca.fr/userfiles/file/lojewimexinewitepijeled.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 18456 bytes
SHA-256: 34db85b0e64ddb4c9c1ad0120c8956f7676623b735b4a301ef5779a82e0b54f8
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 10408 bytes
SHA-256: 95474fa9499e17db24cb2307f1fd22751d0c6cc189d3e7cbcc2f6804ca7fb72c