Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8351884954f8a99…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 10:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52298ec45cff05ed7f291d7bec864f95 SHA-1: 3130187f829cf63e533b627e3afafee9420129ea SHA-256: a8351884954f8a990f872175cb491429a537dda8083f728b2c55b6bb4c8b3846
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://krisoc.ru/uplcv?utm_term=friends+season+6+full+episodes PDF link annotation
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/44347202696.pdfIn PDF document text
    • https://stotex.rs/files/runedapimib.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30484363531.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f354633138---zixuliwenunaripugoz.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33387271166.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_195517.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/31213027639.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/41302288005.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/sajezi.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/ferolakavazedonux.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/fusam.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/sotitolaxene.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/74781336329.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/zixuladegitovudin.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kobax.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/20587637328.pdfIn PDF document text
    • http://ifap.it/images/file/gitufapatamewe.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xubilazupigimikur.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/kodutebatomugotosobilas.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/soxudosu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f48692a9b---jawobabezumarepupo.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/vorabete.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 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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 17052 bytes
SHA-256: 8688d1140e29286cb6a7a1ae2ed4edb76290f42d325d94dc6dcf3ef9d8e032e3
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 10640 bytes
SHA-256: 4d558c9c20ddf26811505a5a0dd8545608f657aaec5407e754d5006898c454ea

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