Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e861548454b517e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-22 10:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fa3d9f818b70321bac8104d694ba4c9 SHA-1: 91cac6c8f245af4c4c3f742abdb40f7df46c6953 SHA-256: 9e861548454b517e621d8afbfdf9ca94d1502dbb2b161b0ebed54eec506aad0d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a malicious intent, possibly for SEO poisoning or phishing, and it's likely that the embedded links would lead to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=xperia+z+ultra+lineage+os PDF link annotation
    • https://ceccardolj.ro/userfiles/file/69173587437.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kibasowivutaxaxaluru.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/97491767998.pdfIn PDF document text
    • http://watch62.ru/files/files/84482284848.pdfIn PDF document text
    • https://basisnomor.com/contents/files/poluvurad.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613521badc564---99980188643.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/kakumejudorak.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/buwegu.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/17790181982.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbl25m8rbqidlhc4p1jd4kg0q0/javadofakobebew.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/16028494076.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/34760747333.pdfIn PDF document text
    • http://web5gstore.com/Files/files/37245978265.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/44196456278.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/zuwetevutivuredowilonitaf.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/nunuvoxatutif.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/63867698928.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/nubamaxotu.pdfIn PDF document text
    • http://tavio.su/files/file/81133224464.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/53437577358.pdfIn PDF document text
    • http://sun-eko.eu/files/file/ratosowisu.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/69771631927.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/92782552171.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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 18856 bytes
SHA-256: 8a41847b66f8df702b164a90240d6710e396876ac028cc4b97279ff6563ac602
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 10596 bytes
SHA-256: 7056ffcf625f735eca91fa304abe45f3ca7bfb0bc0907fc74608aa8da34a8b40

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