Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e51715ff87749d6…

MALICIOUS

PDF

74.1 KB Created: 2021-01-15 18:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d6c24190727da3db4e9128e24d3e432 SHA-1: eec750d762c8cc930f3a588b0ea588a6abc2998b SHA-256: 2e51715ff87749d60ec881aa7616ec9fa94997c71210d88db0363dbcf517c6ae
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious content or phishing sites.

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://trafficel.ru/123?utm_term=curriculum+guide+columbia+law PDF link annotation
    • https://site-1179350.mozfiles.com/files/1179350/barefoot_investor_book_free.pdfIn PDF document text
    • https://site-1187467.mozfiles.com/files/1187467/nupitavojojamazoler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5fbb8b6d26009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fba4acea4ab3.pdfIn PDF document text
    • https://site-1246101.mozfiles.com/files/1246101/personal_blog_templates_free.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/6f9e9de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5faf29c619841.pdfIn PDF document text
    • https://site-1244597.mozfiles.com/files/1244597/kizuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5fa64e611212e.pdfIn PDF document text
    • https://site-1174761.mozfiles.com/files/1174761/jebaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5f97ef027efb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fd87650b7e91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vajefam/cepillo_electrico_o_cepillo_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/dan_murphys_gin_discovery_guide.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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 5220 bytes
SHA-256: 2401ca3c7cb4e65e70e7608fd4afcc5d609c5a2883d06aba050893a4f4c5ccad
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10696 bytes
SHA-256: 3c22bf2b14a3f0d764bf07c9272e57a4086b7ade8d4d3eaff976848dcfbdaed5

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