Malicious PDF — malware analysis report

Static analysis result for SHA-256 6683bced7874c2ed…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 09:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ec81dcfe84f9a31ace8a2bfb4f265ca SHA-1: 63f1c1f6040c9abea8331617c5cd02815dca1efd SHA-256: 6683bced7874c2edc2fc599de2de07b38cc18eb41a35b169d652ca71a7c56356
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, 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 related to phishing or directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=striped+fish+nsw PDF link annotation
    • https://ssvacancy.com/ckfinder/userfiles/files/zebejibawan.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72006128564.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/16165666061.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gikinunutedulazotubipit.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/gerir.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/60454379550.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/rumofozoronejakoma.pdfIn PDF document text
    • https://atrax.hr/files/fekuwubokuvajab.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/14848669274.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144aaaa2befc---xedemirateb.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/varidetigetetavufawo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffddbcd124---zojajudumopixasul.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/wevasatatabomivibu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/pulapelugi.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/vukememogi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/wududivugevuxoxutesufom.pdfIn PDF document text
    • https://thepainter.asia/upload/files/84035715706.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sovemorerixagolele.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/nokuduluzugojipu.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/lerojoje.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/virovajowedozofamabilopis.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/sunoxowobobebaw.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zumepaxejifizagixokixobo.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_off0000bc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC98 10428 bytes
SHA-256: 0c673f03c66fd011129d0afe2cb040881282b0210c5dfe3b27eee843f31301b0
font_01_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 15904 bytes
SHA-256: 01c9cabfe65af476282159a9b1d2de5988a3fdaaba7746516177e2737e853bcb

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