Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ec8bf4575308c1…

MALICIOUS

PDF

84.3 KB Created: 2021-10-27 08:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04b3d52439027af115372d57ab8afe7b SHA-1: 5c1e2edef3ec0d70a2eade2fecc9860443d3a7c1 SHA-256: 18ec8bf4575308c19a64ecda537860e0f367cd4288c3b47a48db677c454b3429
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, and a specific heuristic identified it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fli.edu.mn/ckfinder/userfiles/files/69534799857.pdf In PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/78744088545.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/pujudiwuvomuxuxon.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/77031892828.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/genasitedebi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/30151709801.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/95776317511.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/59327972437.pdfIn PDF document text
    • http://aztkgbv.love-mrt.com/upload/files/nawinetakofugujegifodovo.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/9106131457.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161780eb2d640f---wugonofexigudusavota.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/859838068.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sumeg.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-25/20210925174743360729.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/55855793707.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/japawa.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/sazifabaxilolanorobefonas.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/75222653691.pdfIn PDF document text
    • https://kudusde.org/resimler/files/zirokokaveguv.pdfIn PDF document text
    • http://pedraferro.com/files/files/fuzodixo.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/foxajoforujubekigekum.pdfIn PDF document text
    • http://i-physiology.ru/upload/98332761916.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/xomomadusunipi.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zalolorisesamaxux.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=three+questions+questions+and+answers+class+12+pdfPDF 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 11184 bytes
SHA-256: 036f642c3214c41be54bfbf7633ee0cee6c59e5013b7a21760661175d1f29d84
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 17772 bytes
SHA-256: 35542fb770ace25d3d70ad3557aec7956a2aadbbf6eae9adcdbfd4b9c17b84dd
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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