Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 c4176c2e918d2b51…

MALICIOUS

PDF / .VIR

81.9 KB Created: 2022-04-05 03:30:25 +03:00 Authoring application: mPDF 7.1.0 First seen: 2024-04-16
MD5: 0cb7d69e058989db95082342dd450bac SHA-1: 8b56cb93904f1f1fd42a873b1e4e8779d6059796 SHA-256: c4176c2e918d2b510d1a76922453353f8e10ce797723d1e761bf946a67be4f24
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded URLs and heuristics indicating suspicious activity, including an embedded PDF with its own suspicious findings. The document body presents a lure for downloading a workshop manual, requiring account creation and offering a 'Download Now' button, which is a common social engineering tactic. The presence of multiple embedded PDFs and external URLs suggests a multi-stage attack or a downloader.

Machine Learning

  • Nyx PDF Classifier clean score 0.0012

Heuristics 4

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://srwt.ru/pdf/91 PDF link annotation
    • http://xn--80ahzi.xn--p1ai/userfiles/cannon-carrick-user-manual.xmlIn PDF document text
    • http://freeedu.co.za/node/81118In PDF document text
    • http://cootowlaw.com/images/breadman-pro-875-manual.pdfIn PDF document text
    • http://cornerstonedurham.com/images/breadman-plus-tr845-manual.pdfIn PDF document text
    • https://congviendisan.vn/vi/3m-mp8030-manualIn PDF document text
    • http://www.prawo.bielsko.pl/_upload/cannon-calais-gas-fire-manual.xmlIn PDF document text
    • http://ns.adobe.com/xap/1.0/In 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://dejavu.sourceforge.netIn extracted file (stream_008_off00006e74.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (stream_008_off00006e74.bin)
🗂 Part of campaign: secureserver.net 1471 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00006e74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6E74 20040 bytes
SHA-256: f74ee16628f0d619351c153107c4fbfa7a2dc2cf01b01b228cedc75a53622b4b
font_01_sfnt_off0000a473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA473 19964 bytes
SHA-256: 5154a7c8cf7a9b55c2f939ad6a4a8f8327cd6552b9f68a87c49d10dfc747eaa8
polyglot_child_pdf_off0000000f.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF 83891 bytes
SHA-256: 9830e9c79d3f730379e767ac8d34aa62e5fc0f88b645bdf0fa15bfb6cc85185c
polyglot_child_pdf_off0000001e.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1E 83876 bytes
SHA-256: 0eba166da678f97dccff7e69c91720262c114b73c9fdcb94afde77d2f80532e0
polyglot_child_pdf_off0000002d.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2D 83861 bytes
SHA-256: bf1633fb3e0226998371deee4dc1f2ca5632d7616d830f5a0b4ffd9fc0b207c0
polyglot_child_pdf_off0000003c.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3C 83846 bytes
SHA-256: 24fbba371ebb0268296d59d06059b4d65a4b4374ab7c5e04ed6169f757b8e245

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