Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d48539518e2f6d…

MALICIOUS

PDF

87.1 KB Created: 2021-10-04 22:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c1ac5bc204e35cf23b83c11ed2568e74 SHA-1: adf9dca2f9a3b4da56e08e8c73f5798d75885d74 SHA-256: e2d48539518e2f6d70d87c8dd4be18854660c31e4c5b773d5feb965b29ea0201
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lesrimaudieres.com/images/uploads/file/kabuvudonukudurezidado.pdf In PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/7034558926.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/31072891404.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/56551704092.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/tojevapugurego.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/notoveritixujozig.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/74143588856.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/75670252826.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/jasobumapomolupaxedof.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/66630325941.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/newobixix.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/15150970865.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/59412803845.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/90476537569.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3e757c516f56b80ec80cccc620486511/72821343298.pdfIn PDF document text
    • http://sireny.net/share/files/45559258033.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/65711756763.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d8afee8df---43393153503.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pubopod.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vodaxasinusetefefovibojo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/senevobiw.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/vudapuji.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/31298609582.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/98318674461.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/86726509436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=21+day+fixate+recipesPDF 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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 10636 bytes
SHA-256: 0f340b6583c45ba2b7f6a3a7718b41de3d5dbff55905db4d02e3c16fb7f9bde0
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 21684 bytes
SHA-256: 9c1a7a2bb79214b67cf89d4eae9c0d8af0112f45f093d58eb7acf613dc0526bc
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1