Malicious PDF — malware analysis report

Static analysis result for SHA-256 69009205a4b61617…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 20:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 663bfb6c017bb84956d4b57741fcf571 SHA-1: 9279d349a35039327d7e6c3733d25eae6d740d09 SHA-256: 69009205a4b61617b165885b827cd7680abc8efb8575636584c696db7a6d133b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the heuristic identifying it as a link farm suggest an attempt to direct users to potentially harmful external content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=pet+exam+practice+printable PDF link annotation
    • https://www.andreivieru.com/ckfinder/userfiles/files/67863066831.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/72110110947.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/gupejumivov.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///31779642222.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/30993581753.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/43654079233.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906053107640052.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/lilopetakerinukakabujixuw.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60268431203.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/55619428295.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/8603672446.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xixulibiranemawogol.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/petuzaruwosatumo.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/73365934144.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/bapejizonuxexurureraz.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/32558134719.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/roremotusowajitejimofoki.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/2381134042.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1bd171ed---51687679818.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xumadifiwodugekuwi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/37259170339.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/66942192054.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139f525d5369---ginewirovapajib.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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 10488 bytes
SHA-256: f7617796d42667cd219590a6dbe7467f94131c527b1692efbb3964832eebad2a
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 16436 bytes
SHA-256: 24b3678f6ef8a25933ac839b3bbf68f90f7eb18d37ac622941b939fe51c7dda0

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