Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4174279af1dcca4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 01:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2da66627463171f65bc08e2151d508f4 SHA-1: bf3ae50c176bb593c2f39d4394300337f42fb705 SHA-256: e4174279af1dcca4cd621efea73f5097e26f30e544a981cafcb85a5d01fdc156
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=filter+spam+calls+android PDF link annotation
    • https://icoachyou.biz/images/ckeditor/files/tituzutijuzagibobepe.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/narujelevudabosixade.pdfIn PDF document text
    • http://belniig.by/public/file/62607025768.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/12200822520.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/gevizomavudajepodowam.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/80077489710.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/36768034626.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16149a39d1e95a---dizujog.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/vurorisol.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/movabutazenoboteja.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/fupaniwuxiziwepudoza.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/65061456908.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/20996410157.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/fipesazupezikenati.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/76689526930.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210925052348.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/60655329190.pdfIn PDF document text
    • http://promtour-rural.ro/userfiles/file/61562166896.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ng3tk08jgus3lautoj1d8bcnq/94885747470.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/rowulazulupotefefadulu.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/68010831860.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/12810411927.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/19218462417.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/difusuvikejiredikux.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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 18044 bytes
SHA-256: f72757dd5768b200a5607e477aefbff4cf20249b20b4126ddce436f54cd1d76f
font_02_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 10652 bytes
SHA-256: 4a4cba932007d67604b5c6d32cabe9e6cbfdbd9a9270fe0f5d00d2d3da7a718e

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