Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b47d3c155d96b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 01:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f739bd8dae7cc77a3cc35860bb9dfe60 SHA-1: a60561c719b5203387df5084be6b3be578b6e4c2 SHA-256: c98b47d3c155d96b8bac25a769e36bb4712590c43f6e6dc5e36bc555fedbdb8d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, as the document points to numerous distinct hosts, suggesting an attempt to obscure the true destination or spread malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://sgpeo.pl/users/file/nonadegokukidopusojubabu.pdf In PDF document text
    • https://esperidiaogomes.com/userfiles/files/83461201433.pdfIn PDF document text
    • http://htwy.com/upload/file/sixuw.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/naweli.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/3470263754.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gumafojukopila.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436436cc069---mebuvekavowisupiz.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/tonexidelovixes.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/xonis.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12453682210.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/wetarimorolekaba.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81240319127.pdfIn PDF document text
    • http://hongdacable.com/d/files/widozixitugi.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/refofisorexomufikivebe.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wokojadow.pdfIn PDF document text
    • https://12shio4.com/contents/files/92272219261.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zowape.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/78119684089.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xagimupowesuvivipupoba.pdfIn PDF document text
    • http://onlinevay.com/upload/files/2818311726.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kilusunumaneroku.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kawexopifewenafaxudi.pdfIn PDF document text
    • https://fobh.net/userfiles/files/20404430367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=khesari+lal+new+filmPDF 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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 19952 bytes
SHA-256: 5c24694c9edb0a279012295fa9ea52c96006ae938cb5a1c04442c6666f3ca225
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10340 bytes
SHA-256: c64b15981aa9f08e1f714b4665ff6e5f6a3b6441fc61a95a44b7229f8e526636
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1