Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb3af5849fc24a8…

MALICIOUS

PDF

82.0 KB Created: 2021-04-02 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c1367dbd725b090358a31a082accf4be SHA-1: 5c36ccd411c6eb10c76e88cd16da81fee9d8fd72 SHA-256: 1eb3af5849fc24a8969cf790989e938f66260b4a712339a02b270a7511aa0d2c
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, indicating a phishing or content-luring attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://lozipotod.ru/award?keyword=the+mama+natural+week+by+week+guide+to+pregnancy+and+childbirth+pdf PDF link annotation
    • http://takafebuxoz.22web.org/artritis_reumatoidea_tratamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fe78e00991f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_6008d18b30024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_6021873d89699.pdfIn PDF document text
    • http://zivudib.66ghz.com/11331317081.pdfIn PDF document text
    • http://zemegazi.22web.org/mitotufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_602fbb4a1b421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff287325d9ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeladijigaw.epizy.com/bpsc_prelims_question_paper.pdfIn PDF document text
    • http://xumutopefar.rf.gd/boolean_rails_simple_form.pdfIn PDF document text
    • http://bilixovat.rf.gd/82169109844.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/10245811088.pdfIn PDF document text
    • http://bapatan.rf.gd/94555596274.pdfIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_8ce94ef279fc4ccf8e810da6c52c43c3.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_8d43c0004c2a4091a0b6766ff069dc99.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_157534044ff843bb8b2f0ff06a126757.pdf?index=trueIn PDF document text
    • http://lodavudomajip.epizy.com/division_tables_worksheets_grade_5.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_3966f0d51d164f778cb5abee31a3e1fc.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_e124b5097fca431e93486709bf9ee0c3.pdf?index=trueIn PDF document text
    • http://dikiboxexoginag.epizy.com/lagu_addinu_lana_ai_khodijah.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_ef91918f88954ee0913d2181e5cf3388.pdf?index=trueIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_2393022f989544a4920d88b771b4344a.pdf?index=trueIn 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_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 5740 bytes
SHA-256: 9ecf59f35221d4d65e9c36495f0e04096c75cde9d0184f6595ecce430e2eb873
font_01_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 10436 bytes
SHA-256: cd4e77eec75b795d389e46c3b6875ed28e353c35e8c804ab85e6290aae1c1281

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