Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3d9adc4bee64a9…

MALICIOUS

PDF

70.8 KB Created: 2021-03-31 11:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4d9d86fc51513d1562e355dd8eed51c SHA-1: 52bcb2b756792e6b22e02cd610756e0dc0cb0d43 SHA-256: be3d9adc4bee64a940359fb2e11cd81b887a549f7496c7b28a12229dc91fce11
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 0.9998

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://seumenha.ru/123?utm_term=connect+4+education+music+appreciation+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478927/normal_603e51474618d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5fe7838bea855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5fcc62ab0b8f0.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/jwVIiWq/42282923441.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/lieGahj/xixopekola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_6054afdade734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601baa4829206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6043eac8b4c8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_4c2d7542af474f81bf3084d3855833f2.pdf?index=trueIn PDF document text
    • http://lilivuxaja.rf.gd/brochure_templates_free_for_word_2007.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_08ebcefdedce4e36a48847ca5fa20e2f.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_9e21b01a4ac948c2b3a126fe757ce7b8.pdf?index=trueIn PDF document text
    • http://xojesenokok.epizy.com/lesugogebijireseluxogajij.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/40567077316.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/management_information_systems_degree_description.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 5272 bytes
SHA-256: 4fece6a483171d1d014265edf60ad94c7e8ce67bb44f65b05efe18575e498a22
font_01_sfnt_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 10960 bytes
SHA-256: 467afafb1da2eb472dfb5855afaa644694db35af1abfe0b6260cd77fbb9868c6

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