Malicious PDF — malware analysis report

Static analysis result for SHA-256 0460855fe245aa27…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 00:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9adb359eb2dc9a413c3f41d9a8c9c4e6 SHA-1: ee78a90e9b6620acd2692e9dfceb32015690e8d2 SHA-256: 0460855fe245aa27cf059bab29bf92fdf40ede6898571fc1541fdb5c3686afdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=android+change+icons+at+bottom+of+home+screen PDF link annotation
    • http://tuanayapim.com/rsm/files/86387385511.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/mosire.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/nuxokalowewexonutoxebalaf.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/46920917585.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091409133290.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/xasuvufowogasibanokas.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/relasakuzusilab.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/detonezopebanizulozov.pdfIn PDF document text
    • https://togeltop.net/contents/files/tagujonitido.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jipomomemolopob.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/52849097241.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cc7a1fb4---zalivoruzujemopuvadi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tokafutasetexe.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/vovoda.pdfIn PDF document text
    • http://sparkpro.lv/content/file/bebikitedonokawezopoti.pdfIn PDF document text
    • http://abwrva.com/uploads/files/69313983709.pdfIn PDF document text
    • http://pololanna.com/user_img/files/junijomosotokebazekole.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/tuxalorixixolaxijizil.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/80395153173.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/gususuturuwad.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/taxowonakigekesa.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/9116729857.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/guveku.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/20963289230.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 18236 bytes
SHA-256: 29f2a83dfee6f36e70939d33c77f910f92feacee6ce82f2dce245da6afc11a70
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 11000 bytes
SHA-256: 2d48059f245fbcf7ef29790af001a2cff1393647149919d59de35da7cb3793c6

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