Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1f601b70d50554…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae43c0a0131a4d75eb7fcc61dbff17d6 SHA-1: 175afe6bceaac5e94eb81e54cf86dcd7754fecc9 SHA-256: dd1f601b70d50554188b1683f7f6f216a9aa65c467379b846797088f8fccb0c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, and the presence of external URIs further supports this. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=best+camera+phone+price+in+sri+lanka PDF link annotation
    • http://abnigakgdsg.friendship-match.com/upload/files/61232147684.pdfIn PDF document text
    • https://solturism.ro/images/file/59591944299.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/81057777049.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/28875866029.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wisigarojesiwamasipevi.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/99740220935.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/853b6a134c533c1caee9ad3854e110e5/65118982457.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/juvegudegefawabixuzut.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/xovebepigopolavixug.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/lesuxetamerif.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wazotom.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jamofewelewetorirafumexa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/27d5715565f64abe5f45bfc306f83b2a/90745785927.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/64626912635.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/xazuzovati.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/laxijedupupebupirimuzolez.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/32600846368.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/58410405493.pdfIn PDF document text
    • http://profstil.az/userfiles/file/9132247869.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/36484883137.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mozanizorobad.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 17664 bytes
SHA-256: 7e68ff5b8974c9a2aefffaa141d2c358b6048a59e4e21089d305eb895de82809
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10784 bytes
SHA-256: 3af15b64ec4456d7f4e183325c2ff87d0a83165c1c262b50ffe9c322ef156940
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1