Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ada6945bf0a6191…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 18:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4892efb2fc1e616d5a390dc7b0fe4af SHA-1: 067804b3750f8b6acf901688de3205e63d9bbf11 SHA-256: 6ada6945bf0a6191cac70ddc0abc372a7bfa025d61921a9153cc69030268b0ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+to+create+a+app+in+android+studio PDF link annotation
    • http://osingenieria.com/images/admin/file/pezujugafevute.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2ade7520---99979237032.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906034518.pdfIn PDF document text
    • http://klpa.net/userData/board/file/69710861643.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/buzofusefifin.pdfIn PDF document text
    • http://17njl.com/userfiles/files/21535749695.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gulasigopabepa.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/499887627.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/dixajimugigulavozebusabo.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nudizegababolexipedoz.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/35856171914.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/ranewipisadorobejomez.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/dupukotesafa.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kilekanojuribepokoxem.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35077649744.pdfIn PDF document text
    • https://kuepancong.com/contents/files/gugefobunu.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/13635440302.pdfIn PDF document text
    • http://orderkai.com/uploads/files/dedivevujowoxebabumomo.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wilenir.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/39032055755.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • http://ewtch.com/upload/files/leruxurokigafov.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/52198207418.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/47077218066.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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 10640 bytes
SHA-256: 434caa19acef5a3fb512f40854afab485e57959091088be7b6021c5f658a3928
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 18056 bytes
SHA-256: 61ee6ce48b321325a3a94458e209a23a5229f5abf08be4e1fd0adb54b4b104a5