Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9695c598830bbf9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 20:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da8d5d42b7a4df306e4d216f6b358c1a SHA-1: 29d0e530470636e160f874e6e0f431cd5d086b53 SHA-256: c9695c598830bbf91660792d9bcf52f2946081e3dc8a58e41530ad2fa84ea3ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious sites for phishing or malware delivery. The ML classifier's high output score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/zurasatewuxitub.pdf In PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/78676858740.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/duligononamosotenadek.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/nagakibuxubalukapeg.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/1928171550.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/getotep.pdfIn PDF document text
    • http://geoman.cz/data/file/vitupumuxezuzenimifenope.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/81396467707.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/26015955896.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wudutipulisozerupase.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/39653627518.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/25460464669.pdfIn PDF document text
    • https://mimpishio.com/contents/files/10475393317.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/60833142104.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/31192150265.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ginujokikumosojuji.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/21911230188.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/99608645294.pdfIn PDF document text
    • https://phuquiland.com/upload/files/55290108088.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/67562497473.pdfIn PDF document text
    • http://belniig.by/public/file/dadijabinovitibebagigo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b11ec1c4a---pidetebapalaviresawaz.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/35592596559.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9ec175d7---45494800086.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/popajogudajadeboluko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+prado+car+parking+mod+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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 17292 bytes
SHA-256: 1418863e34d11458b17071b5ad298aa5a163fb43a032162abf78b63df7e03c5a
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10956 bytes
SHA-256: 948fb01face1a57a4697c1f13f322fbed0775104b5df5e689d4a8aba158b2f75