Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a217d43e60e5893…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 06:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7264cfbbbbf6354f9ba68d4134ca57be SHA-1: 26cc1d6b8bcbff5b74f9cbf254481cd7806fc193 SHA-256: 9a217d43e60e58930147bd6fef0325d25ca9174894bb27d95740fdc1fda6afc9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript (T1059.007) suggests the PDF is designed to execute malicious code, likely to redirect the user to one of the listed external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=halley%27s+comet+2020 PDF link annotation
    • http://www.heksan.com.pl/file/ginitop.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/botevunekirenolewatukizog.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/27499082111.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/1255113828.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/sazedasofoxuzivikabusiga.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/55976470237.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wadenarotabewubi.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/kunogoru.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/24247929793.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/27784156201.pdfIn PDF document text
    • https://maviet.vn/upload/files/sijuguwoverowi.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210905041218.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/38483573548.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/89135856641.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/34829338687.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090916265847.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79106402948.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ee6dbb63---85792033508.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/jakaz.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/mowevukofodosidizasi.pdfIn PDF document text
    • http://domainecomps.com/documents/files/bipuk.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/sovefuni.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/37217383902.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10476 bytes
SHA-256: 739a8e3f1245ef6220d04b49ba966ddf59b95fadf0c5eb296f09abc823359865
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 17740 bytes
SHA-256: ec17c14508afa9e189d47d2721fb13a5eb3de778da7204891774d5ad53eb5a3f
font_02_sfnt_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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