Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbef63ba1a79653d…

MALICIOUS

PDF

90.9 KB Created: 2021-03-16 02:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0c93f3cba53ec2573e8aac450ca8cc8 SHA-1: 3cfada93fa7d9653154921460903703fc311da06 SHA-256: fbef63ba1a79653de6328eca9a9bd4b6a495dfff185eb91836627ca711dd4f2e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/wix?keyword=stanley+yelnats+holes PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_197c07ddf40a46b1bd758dc98460b700.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daea6fc9-9767-4198-99c3-103ed525861c/vox_valvetronix_vt30_presets.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_a6bed9e2196742239df5cd2ee53a4d1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2993919f-a5b5-4391-9f01-9e45fe87ace7/five_tibetan_rites_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9144e548-4f81-471e-8a6b-c33cf0f6c7fd/24047891324.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_e658aec133534aa3bdcb3115e084ccfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83754d62-9ae2-4b0d-bf58-cccfe5de0d90/79321589769.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_235696d3bb3f4ddf886b225e6e64e3e4.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_c1c84615900c47078682dc27fe794ee8.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_9e51891da7134607a0081657b66030a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d71b50d-c0a1-47fe-ab44-e1893a381bb5/55148726015.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_dbf5a39e455b494299f39fa4b39e94e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3574c50-2d6d-4b62-948d-60db5a8f0f62/73184515835.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_d0169d953e3e427dba02e9fb4cb21e24.pdf?index=trueIn PDF document text
    • http://zipulosi.atwebpages.com/zexojudanokenixabunifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18368684-ac69-4c76-947f-f886e920d458/93356943498.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/suninulupewelekaxefizoka.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 4880 bytes
SHA-256: a2ff579bdd1ec1fa3e41670d49f122c0abe91f82f8a29df588d468a031050cb9
font_01_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 11592 bytes
SHA-256: 239d010d7c00cbabce1c73c805feec4e371259e61a7555b18ff7519016d6b179