Malicious PDF — malware analysis report

Static analysis result for SHA-256 4660fb8964db4efd…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 15:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 09b644d0dc186bee6f6fc38a777f69d0 SHA-1: 867f268b515893adff994c34629d7d191b9ad848 SHA-256: 4660fb8964db4efded59f79717052e445573bce59873ba0ad67b22ec1ac488b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were extracted, the structure suggests the document is designed to redirect users to potentially malicious content or for SEO spam purposes.

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://botokaw.ru/wix?keyword=colt+ar15+stripped+upper PDF link annotation
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/03d43d8e3aba7.pdfIn PDF document text
    • http://flipping-car.online/7906507775comuu.pdfIn PDF document text
    • http://allroadkamchatka.ru/zones_of_regulation_visuals_freeg82id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fc5772980ea1.pdfIn PDF document text
    • https://nilarekatopa.weebly.com/uploads/1/3/1/1/131163832/6733238c1c5c92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60186d90e367e.pdfIn PDF document text
    • http://luminar4-download.xyz/723267791369dtpj.pdfIn PDF document text
    • http://qunit.space/gamefly_coupon_codes_september_2020eoha6.pdfIn PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/1334954.pdfIn PDF document text
    • http://stingeksoj.online/4197707462ajns5.pdfIn PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/7718842.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/teledyne_laars_boiler_manualx12j8.pdfIn PDF document text
    • http://obmenkalnr.online/bosidopoboxogurnmd58.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/jegogawejolisiborap.pdfIn PDF document text
    • http://arendagg.xyz/42991613319ckue5.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/77fb0e2a-e84e-4298-bef4-6c14196d77df/zagijoka.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d293f09145d04d2dbb140e6e5e2ffa30.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_e39e482d116548d3a4f27486d9155858.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32207a3d-b1f2-4cba-a2a7-d5cb4ae7f33c/1603837473.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_44737faa4763433c83112ef5e25ee2e2.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_5c254ee87083412fa0f0b8c46b4330b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06902cbf-a70b-4fdb-92d5-2823f2c3e502/43921071077.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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5032 bytes
SHA-256: 9cfb377fc9eb50fdeb3f02709097f5b076a826beb352457c2aa3d6b51b9bac1a
font_01_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 11048 bytes
SHA-256: 74d3cef5fda5511ba66bf659ea8821906fd6985a752466b0395fb1c76c2c7db0

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