Malicious PDF — malware analysis report

Static analysis result for SHA-256 f689c3b9ace6ccfb…

MALICIOUS

PDF

33.8 KB Created: 2020-04-07 11:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfa0ecc2b2a8ef12252ab0996f1a0f70 SHA-1: 628e1ec31d58578bf9ddd954cb074306860301d8 SHA-256: f689c3b9ace6ccfb4426c76c69adf89b02f18d0e34ca21dfa7e46536ce96be8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. The document body, though partially garbled, contains a title and references wkhtmltopdf, suggesting it was generated programmatically. The primary function appears to be redirecting users to a multitude of other PDF documents hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mundoartecom.com/uploads/1/3/0/2/130287934/130287934.html#que+significa+heterogenea+poblacion
    • http://vaoilandgas.info/uploads/1/3/0/9/130969016/zukutemuwif_zotezufojoz_nuwepagazime.pdf
    • http://platinumbronzespraytans.com/uploads/1/3/1/0/131071151/435431.pdf
    • http://acnibo.org/uploads/1/3/1/4/131454034/5121983.pdf
    • http://fairytalesandwar.net/uploads/1/3/0/9/130969264/filokopa_wetasiravuxun.pdf
    • http://elevatedmorsel.com/uploads/1/3/0/5/130540458/1ecd8.pdf
    • http://proteqfone.com/uploads/1/3/0/8/130874017/kalefefikaloj-katelotedorumul-masigeve.pdf
    • http://sh8kmusic.com/uploads/1/3/0/5/130551331/xoxow.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_off00005ef8.bin
5371c4c926f95c61bfaaa5e0f980ae537ce41ac4f3acb40acc1e98626d8e1bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 7608 bytes

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