Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e75a10644b97fe3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 01:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6d4237abb9fabe4cd3fe86dc09fbe795 SHA-1: 0d3fe23c6c7d3f66f2a759aeb240746ba3646fb4 SHA-256: 6e75a10644b97fe3ac0036cf7f366188039f2c339741ffcfb5e7ee49b9108e58
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 http://sherwoodonionfestival.com/ckfinder/userfiles/files/93303656476.pdf In PDF document text
    • http://chochosanencino.com/uploads/files/82277562040.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jedunizonozekamuwadavoreg.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tutosu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32563912973.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/xukubekofa.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wawizutegates.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/41155302114.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/51064577908.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/xomuwutarasifuno.pdfIn PDF document text
    • http://birdwatching.sk/media/file/33313465755.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/27507732664.pdfIn PDF document text
    • http://www.bash.cl/media/file/55879559363.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/76250921707.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/10305002697.pdfIn PDF document text
    • http://gojjang.com/uploads/files/93935301715.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/91224061127.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/630966072.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/87704173630.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd98c642d---1993137703.pdfIn PDF document text
    • https://mihalex.by/files/files/95229243990.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/wusuguli.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/senabufifafijokowur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=day+to+day+expenses+apkPDF link annotation
    • 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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10456 bytes
SHA-256: 195e616c0827137e7cc99822c54cd4c42637ccd55f8098a45419055f444ed51d
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 21420 bytes
SHA-256: eca133dfc660bcd652282d76b3698edb7939bcc73318e8995444d9535d132167

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