Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a346b122006972…

MALICIOUS

PDF

37.6 KB Created: 2020-06-12 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c935a81ba4f61ee9bc7419155f16f735 SHA-1: 2469f1a7760f9a31b76c8afb971f8b7741daf17f SHA-256: b1a346b12200697230f0f939c8007817a3f1e2a15f5a28d7322a70bfb07cfc95
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://adventuresbyprice.com/uploads/1/3/0/5/130544318/130544318.html#morning+laughter+yoga+exercises
    • http://marketing-intelligence.community/uploads/1/3/1/3/131380836/9239290.pdf
    • http://dianeebloom.com/uploads/1/3/1/4/131454306/67617df.pdf
    • http://alainaffleloufranquicia.com/uploads/1/3/0/8/130874276/406c97b63.pdf
    • http://gps-mil.com/uploads/1/3/0/5/130589061/nuwubotuvamuxog_sazijala_didawekux.pdf
    • http://webdisk.miniaturesbygarcia.com/uploads/1/3/0/7/130776724/jozuf.pdf
    • http://chappellhaysassociates.com/uploads/1/3/1/3/131380066/sagedagejiku.pdf
    • http://farmgatelatches.com/uploads/1/3/0/5/130539517/kurudekosunume_jivubisap.pdf
    • https://tesukejiget.files.wordpress.com/2020/06/55767144622.pdf
    • https://kenubid.files.wordpress.com/2020/06/83594618354.pdf
    • https://pigumofow.files.wordpress.com/2020/06/21252525668.pdf
    • https://gekezubuwubi.files.wordpress.com/2020/06/63220664781.pdf
    • https://nojisaxopo.files.wordpress.com/2020/06/73311356685.pdf
    • https://nodezebibun.files.wordpress.com/2020/06/46998676825.pdf
    • https://jorajeto.files.wordpress.com/2020/06/98320214175.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674e.bin
e68fb7a63edc009934679df09a45aa81c738316f0b3b4c2723a68f8c15ec41b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674E 10512 bytes

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