Malicious PDF — malware analysis report

Static analysis result for SHA-256 92350647869bd3a7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 02:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d99cb0a0a9bc73e3f57e48342b3fe277 SHA-1: 8154878de9d89bb20501bc716bb424a040885802 SHA-256: 92350647869bd3a78560ad9928a9b2659a044ca7d2ab89f0888a1421649de911
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier also flagged the PDF as malicious with high confidence. The sample appears to be a link farm designed to redirect users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://sevoir.hu/uploads/file/zonego.pdf In PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/vokel.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210922_C9A1CE6E6B8E484C.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/532989121.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/604bc9f0eb30df857089e72a92b21d6e/88790621777.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/butonitonetux.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/powavaragenasutezupoxali.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161344cc916929---nawimoniwomemojot.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/sipojodape.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/308919297.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/60791901166.pdfIn PDF document text
    • https://dacola.com/upload/files/87496067503.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bavotuxojekutodoxanirijod.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/63123559556.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7878904166.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210903000911_o4yo3a.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/lisebodukimudaxedemifu.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/83972547007.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/fumunal.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/mububinekafu.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/dovafigiwuzu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/8713711802.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/jaduxadafidavomaw.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/84055887267.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/32759498958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=will+iphone+sim+work+in+androidPDF 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_off0000b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 10728 bytes
SHA-256: cb01ca85611a2fde6dd3aeda419e6714ef9fdf84f4a992e4e6556236b005950b
font_01_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 15572 bytes
SHA-256: 5091e387e357bca242d29de891c55685977971b6f8e301501e66cf8af959c0fb
font_02_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1