Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb428e8a1913c8…

MALICIOUS

PDF

30.3 KB Created: 2020-11-06 15:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f0b7501d87d2bf1692a68372aac4b36f SHA-1: dcb202367d4b4234aeac11afacbbf87e7c10847f SHA-256: d5eb428e8a1913c835ef78bbc9067e218f94dc38c3770060d8422e5d45d2783b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 1.0000

Heuristics 4

  • 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.
  • 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://traffnew.ru/123?keyword=serena+williams+instagram+story PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f94a36c0ca3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f9565e1d3b1d.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/fasanag/45375322082.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/les_animaux_fantastiques_les_crimes_de_grindelwald_livre.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/automotive_body_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/cardiology_medicine_book.pdfIn PDF document text
    • https://malopotobi.files.wordpress.com/2020/11/metapobumokozukufaxodazu.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/suxenidobu.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/assoinvoice_convertire_in.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/93056311571.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_off00003c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C86 5304 bytes
SHA-256: 18900b17fca7bef7d1d27d0dc64be6fd62c95331bb2e0b1acd0e849563674d19
font_01_sfnt_off00004e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8C 8916 bytes
SHA-256: 2277f5d439b1968fc04033d57b56d255f338c17719999be3983d4f31366421de

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