Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 837948e853703294…

MALICIOUS

PDF / .VIR

35.0 KB Created: 2022-12-01 21:14:32 +00:00 Authoring application: natsae (via mPDF 8.1.2) First seen: 2024-09-20
MD5: de68866690022505d928d7bfad3c0cf8 SHA-1: 943360d54dc9c3dbbd8244f7ffa2cab79476d1e9 SHA-256: 837948e8537032945b222e577ba5bfe015ea21bbcdf40071f38c57ca04f2a2df
104 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

Heuristics 4

  • Cracked-software lure uses shortlink/download gateway critical PDF_CRACKED_SOFTWARE_SHORTLINK_LURE
    PDF visible text advertises a crack, serial number, archive, or pirated-software download and pairs it with a shortlink or encoded download gateway. This is a high-confidence social-engineering carrier for unwanted software or droppers; the PDF itself is not a parser exploit.
  • PDF links to a cracked-software download doorway (base64-obfuscated) high PDF_CRACKED_SOFTWARE_DOWNLOAD_DOORWAY
    PDF's embedded link hides a pirated-software title as a base64 blob inside the URL path/query (and/or carries the ``download|`` doorway-template marker), rather than in visible text. This is a TCPDF-generated SEO doorway that ranks for software-piracy searches and funnels users to fake 'crack/keygen' download pages distributing adware, potentially-unwanted programs, or droppers. The base64 encoding is deliberate obfuscation to evade plaintext lure rules; the PDF itself carries no parser exploit — the risk is the linked crack-download destination.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://raisengine.com/chery/freeload/annually/VmlydHVhbCBESiA1LjIgU2tpbnMgQW5kIEVmZmVjdHMgKG9ubHkpIEZyZWUgRG93bmxvYWQVml&ZG93bmxvYWR8SmY0TVhKellueDhNVFkyT1RnMk1qSTRObng4TWpVNU1IeDhLRTBwSUZkdmNtUndjbVZ6Y3lCYldFMU1VbEJESUZZeUlGQkVSbDA/spotlessly/ PDF link annotation
    • https://autko.nl/2022/12/download-link-driver-advan-g4c-81232/In PDF document text
    • https://beddinge20.se/nina-de-12-anos-follando-con-su-perro/In PDF document text
    • https://www.place-corner.com/siener-van-rensburg-voorspellings-pdf-download-patched/In PDF document text
    • https://randys.us/wp-content/uploads/2022/12/Icse_Class_9_Chemistry_Book_Pdf_Free_335_WORK.pdfIn PDF document text
    • http://turismoaccesiblepr.org/?p=44705In PDF document text
    • https://www.aveke.fr/wp-content/uploads/2022/12/almlaur.pdfIn PDF document text
    • https://womss.com/keyword-snatcher-1-19-cracked-exclusive/In PDF document text
    • https://teenmemorywall.com/answer-key-for-adelante-uno-chapter-3-workbookzip/In PDF document text
    • https://moodydose.com/wp-content/uploads/2022/12/All_Things_Fair_1995_Movie_Free_Download_NEW.pdfIn PDF document text
    • https://globalpoetandpoetry.com/wp-content/uploads/2022/12/Arkaos_Nuvj_15_Serial_Number.pdfIn PDF document text
    • http://raisengine.com/chery/freeload/annually/vmlydhvhbcbesia1ljigu2tpbnmgqw5kievmzmvjdhmgkg9ubhkpiezyzwugrg93bmxvywqvml&zg93bmxvywr8smy0tvhkelluedhnvfkyt1rnmk1qstrobng4twpvnu1iedhlrtbwsuzkdmntundjbvz6y3lcyldfmu1vbejesuzzeulgqkvsbda/spotlessly/In PDF document text
    • http://dejavu.sourceforge.netIn extracted file (stream_003_off000025ae.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (stream_003_off000025ae.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000025ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x25AE 19964 bytes
SHA-256: 383c9da4c70a16cd975e8582fa6b11549d297229ea0ac251d7bea590ccdaae35
font_01_sfnt_off000059bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 19964 bytes
SHA-256: 5154a7c8cf7a9b55c2f939ad6a4a8f8327cd6552b9f68a87c49d10dfc747eaa8