Malicious PDF — malware analysis report

Static analysis result for SHA-256 9807efee7eb88cbe…

MALICIOUS

PDF

92.1 KB Created: 2021-11-03 06:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1d3a2d54348aa6cee0c46f2f509342f7 SHA-1: ef0e20e83bc5e8e708faf753d89dcded1b4c3820 SHA-256: 9807efee7eb88cbe5d452e1975ba2ceae47456f35af701f4dcf8032b420d7979
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://files.ibiza-ferien.de/file/pesaliletusijuk.pdf In PDF document text
    • https://jewfri.kr/files/image/files/losimetetesipamimuvu.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/3375500476.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/vapijuxoxasa.pdfIn PDF document text
    • http://someteme.com/archivos/_20211011162317.pdfIn PDF document text
    • http://metall-press.ru/files/8425704875.pdfIn PDF document text
    • https://venus-forever.com/image/files/23409014015.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/77503338369.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/rinunepuzanotojoba.pdfIn PDF document text
    • https://cap2013.aseat.fr/userfiles/file/togovidefewurakura.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/28979229589.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/pufitiwazorapiriwukomoji.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/40631978270.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906181517.pdfIn PDF document text
    • http://gibisch.com/files/files/texajivebafupapomereguvu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1617ec6827ba4c---62584534206.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/15042830710.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/filidon.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/33316072294.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/26517986873.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/64721606844.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f21941bc84---xezinodatulepuzofupilod.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/xusemunedepawopazowipoval.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/29193884927.pdfIn PDF document text
    • http://reopen911.info/media/file/36670536537.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=always+forever+with+youPDF 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_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10552 bytes
SHA-256: 17438068dbefbf8d317f0b44568c4a8903aecdcbe71cc62a3608772e6bfdbdbd
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 18852 bytes
SHA-256: e45a4a3d002a936ed3d7e4856b307c01ffde8f7dd20ed05417ea431ac3d6a132