Malicious PDF — malware analysis report

Static analysis result for SHA-256 03294cabd3c41cc7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 06:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 359ff4c95014703ddd6607f4b502ad47 SHA-1: 106a6a15109e0c57647905b4b051100d26a42a40 SHA-256: 03294cabd3c41cc7a7c9b7982bc7772dffafe628fbf5754410bbf0c0797e2341
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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 http://thainightjob.com/ckfinder/userfiles/files/33032311422.pdf In PDF document text
    • http://brukbet.com/user_images/file/malopojikefoguj.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/2089947552.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde994e71d---nuzenuweto.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/70172062309.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/77778504016.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/27671995378.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/84125393658.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/27560622700.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/zodevutu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/girebune.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/41370519571.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lokemadebixizodaji.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/vegosofizitizige.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210924191838.pdfIn PDF document text
    • http://tfforming.ru/d/files/50029666019.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/dexutepam.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/17344722011.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dowekazoxel.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/26950411002.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210923142309.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150e693050af---tinuxewowopuwejetumejapu.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/girowewefolupegag.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/jusenilupad.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/pususabuxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+adventures+of+an+it+leader+pdfPDF 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_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 17988 bytes
SHA-256: b5c0d43106cc1fd03c8ff424992a32e003ae165ab30f20279e60602e311597ba
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10724 bytes
SHA-256: 47e3706cb8af1491a85e62dac634fd04f66343d3d6bafa58f844aefde21a7108

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