Malicious PDF — malware analysis report

Static analysis result for SHA-256 559e2ea54aa6d770…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 12:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f4e093ac43d55c6425d57b23bc25f11 SHA-1: 602ab849456aba9f4c7f51dc8ec68e4a0acafdab SHA-256: 559e2ea54aa6d770ba59f27b182d63f9833f19c580f9d55c8a2aff8130ac2172
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF contains a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chulintemple.org/CKEdit/upload/files/83866802796.pdf In PDF document text
    • http://metall-press.ru/files/fudegunagumoz.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gimedoginisa.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/68776628601.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2e48ed7ed7e572529b798b12486fae74/30795708137.pdfIn PDF document text
    • http://reopen911.info/media/file/98682486518.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/96801766566.pdfIn PDF document text
    • http://szhlfz.net/upload/nagogofivixivas.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/83666692887.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zawokotivar.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/73622665363.pdfIn PDF document text
    • http://mayjack.com/upload/files/34962158497.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/dipazabisogamijasowajefev.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xajodo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901080644904385.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tabasalemeniruropewab.pdfIn PDF document text
    • http://soc-in.com/data/media/files/59558927527.pdfIn PDF document text
    • https://begili.com/uploads/image/files/gozimiwu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908211045780.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/dilesexopevenigoduwinike.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/22962087980.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2549759db---64071150409.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/33201146397.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sogowuriminovikimosuw.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zivepijatoxijaxefuwuwiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sd+card+recovery+tool+for+androidPDF 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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10556 bytes
SHA-256: 0f18f65f2e20c8b5dda1e5c4927799ff130ce8d2629a81fff29a74fb59f62ea3
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 17288 bytes
SHA-256: 4573d3884b511bab28d5f8e67e09af9c1b552daa08dad4f3140dc9d5d1ce5ad7
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1