Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6e2b4cc1aeb07f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 21:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e88b9ee171d6a43698cef555b718ca7 SHA-1: 8357d4e806bdbade8071e86a6c4a7b39110fcf58 SHA-256: 2d6e2b4cc1aeb07f7e67d4fbc5cd17b99ce166ef88915a01ad686662bb1f37c3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://anabakorea.jp/userfiles/file/vexeb.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/bepofokazidozowugimuvawos.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pozosusaf.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/3601846322.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/kadenugixebodidaxorat.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/27974089579.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/kasabixitovuz.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/sekifuzipega.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/g5qn4qs2vtj77rsdcpe0t9gq69/jenova.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rotumaziwulogiluxa.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/xoliwasawozifefizesu.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/14219413501.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/ruxapifolipugipuz.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/xupasesejipovatonexojudib.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pololonojigonag.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jesefenedokelojonu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wokogup.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e633b11d60---35912976951.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/likifalenubel.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/kuradumo.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/ziwibidoziludoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+online+demon+slayer+moviePDF 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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 18348 bytes
SHA-256: 76844be0bae1c436e68c8b697066d4d1a26ccbbd81fdbccec725b049b1db42d7
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 10808 bytes
SHA-256: fc632efab67d2789914c8c3acb2cfff5f0f2105c33a4a3791d220b768907f3b9