Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d169365908bec4f…

MALICIOUS

PDF

74.7 KB Created: 2021-04-02 13:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 99e873479435d6819dc6a1584fc1e664 SHA-1: 7746244d09d15a818b8571dca8a4061ee34288f8 SHA-256: 8d169365908bec4f492481dd9b7ab5f98222e0e390ca67e24ecf340e03efa593
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://dugedepap.ru/award?keyword=pro+style+spread+offense+playbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392867/normal_6002f0446083e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_60339ed416d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fda0d52bc95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_601abd17e9e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_60313032dc6b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_6001803058695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60074c236c6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_600f3fa0e439c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_600bc8931af0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_603c62fd861de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_5fdb28eaa8e7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d815a506-eea0-4229-af47-a215ff3f81ec/what_does_color_purple_mean_in_hebrew.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_6724c5e12d5b4108ae70c3f35bb5785b.pdf?index=trueIn PDF document text
    • http://tobifovibel.rf.gd/57504733800.pdfIn PDF document text
    • http://pejibuturu.epizy.com/circular_polarization_antenna.pdfIn PDF document text
    • http://jamujufumazuwir.rf.gd/calendario_as_roma_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ed7bbb-be55-4afb-97c0-521f3dd14da3/aeneid_book_4_latin_analysis.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_48ceffa707d14dbcbd6b41171660d69c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fba43d9-af1b-45fa-bf02-cca9522193fe/project_manager_salary_in_pakistan.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_508d7393eb694ea3a498b90c68d40b33.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_7a498e1e49d14bed8e5c4337f83e799c.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_4c21d7addee34885afcb0f47ae940988.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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5344 bytes
SHA-256: 64775e89848d3768f43520a8f3562c988cae17af5ccbcde4c43925884ebc138e
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 10876 bytes
SHA-256: acfc73a1c16ac445360c558cfeb2f51c7e268ec23d69992e43ee2d730b360f10

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