Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 c983581bfe855435…

MALICIOUS

PDF / .VIR

391.8 KB Created: 2023-09-06 12:56:30 Authoring application: Adobe PDF Library 9.0 First seen: 2024-09-20
MD5: 87e9d58cbcbe37b3a13fb66760041e30 SHA-1: dc2d245d70bc8644764d9b095e62dc7e143ecfef SHA-256: c983581bfe85543569ec932708ec3fc53d08f61e56a74df81770484afe54ed28
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, masquerading as travel expense reports, which are likely intended to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a distribution or redirection mechanism. No scripts were extracted, but the document's content and embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

Heuristics 4

  • PDF carries website-builder CDN document link farm medium PDF_CDN_PDF_LINK_FARM
    PDF contains many clickable PDF links parked on website-builder CDNs or simple download gateways together with visible ebook, manual, or download lure text. This matches generated SEO document carriers used to route users through untrusted link/download chains; the PDF itself is an inert link carrier.
  • 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 https://auditing-a-practical-approach-3rd-edition-pdf.the-rough-edges.de/904495.pdf In PDF document text
    • https://tufegoxuxe.peykweb.com/xotizi.pdfIn PDF document text
    • https://wofase.slothoki96.com/485400.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/5c2560ea-b5d8-4666-ab82-1b9238c09b6c/downloads/95888903685.pdfPDF link annotation
    • https://img1.wsimg.com/blobby/go/95adebdd-dc2e-423f-a884-3a8b65a1da11/downloads/90818110778.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/fa1454a1-e91c-44f9-9f76-8fd5b7280d0f/downloads/8886007942.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/790837b7-a62d-419f-8a70-91e233100ea9/downloads/tulotuxujatobo.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/d7180b00-71c7-4635-9a2a-090bf4ca618e/downloads/pubg_ban_trung_quoc_cho_android.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/1f4d2e7c-e789-4d8a-bc56-b3cdcb743fa4/downloads/bisufonuwazipo.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/e27a80e7-8879-482d-85cb-31c584223a92/downloads/improvement_in_food_resources_class_9.pdfIn PDF document text
    • https://img1.wsimg.com/blobby/go/ee07f9a9-042d-490f-b5a6-f1f96ee7a79e/downloads/movus.pdfIn 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://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 extracted file (font_00_sfnt_off0005c829.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0005c829.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C829 11676 bytes
SHA-256: e6ee2b3a99427b29fc23a55e258464648ac1e50a963b00daf421855430ae641e
font_01_sfnt_off0005e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3DC 17416 bytes
SHA-256: f3e10f3d5d7f64216a74f0d9d2e59cc4006261ad26492fcfb9f3ea05827c0ce2