Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c1fbc264184181…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 04:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4c0730faf97111975d9ce3953aedb74 SHA-1: 1c8d55cee80685f856ebcf3cbf8ecb5d72bde574 SHA-256: 47c1fbc2641841811a7f05d8ea9e94d7f42373a6b3d3adbb7987fdbdba959452
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded JS suggests it's used to facilitate the redirection or exploit vulnerabilities. The sample's structure and the high number of links point towards a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=lomachenko+fight+live+free PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/797457f4275bff67716f586ee2f9215d/vowobesatagosibobagi.pdfIn PDF document text
    • https://maymac.info/userfiles/file/50102052620.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/potipizozofowel.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/697865454.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/xexisili.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sefediwezimimefolo.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1669384452.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/64749748803.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/38099408969.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/88502058542.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/natadu.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/76120169713.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/badibivarusowufodutug.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13497421976.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/84482053445.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/79183526950.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lonisodagibemewa.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/15279990885.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6141b3ce301d1.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192447205916.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/33776960903.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_C384EDBB75A281AE.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/56892850259.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momezujez.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/90522274858.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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 10732 bytes
SHA-256: cce639aff93a7606de44b84eba9601cfeaf64192b0fc0f41a68351b3e8dcee98
font_01_sfnt_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 16960 bytes
SHA-256: 914efec07958854feba8897dcdc8604b44a27efea067fe24a67f4794b4bebcad
font_02_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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