Malicious PDF — malware analysis report

Static analysis result for SHA-256 283d8ec0dcbec10a…

MALICIOUS

PDF

56.6 KB Created: 2020-05-22 18:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eebc7fb898930a39cfee2711d0dc8ac7 SHA-1: 1231ca5b667d774518fd82aa9e4d3725eaaebcf5 SHA-256: 283d8ec0dcbec10ac9181288d2588f0ed9d96450453cd8f83a7a557704e2769c
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains some text and URLs, but the primary malicious function appears to be the distribution of links to other potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9043

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://ie.undesirable.us/uploads/1/3/0/6/130639024/130639024.html#kadhalikum+aasai+illai+hd
    • http://cpcalendars.bizblog.hk/uploads/1/3/0/6/130605198/doputavixisen_jexiso.pdf
    • http://jonnyessex.com/uploads/1/3/0/5/130588164/gagisiveresagiw.pdf
    • http://knowledgeonthespot.org/uploads/1/3/1/4/131407709/kijiboxizo.pdf
    • http://dieterstaelens.be/uploads/1/3/1/0/131071252/fazatol.pdf
    • http://alloexo.solutions/uploads/1/3/1/8/131856543/tonuvujomedusuzi.pdf
    • http://gernielove.com/uploads/1/3/1/3/131380158/dafiwapolivar.pdf
    • http://team-robinson-properties.com/uploads/1/3/1/4/131437298/zigenalapepazul-givogum-kotizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000819b.bin
64166167955dca8ad4214712c397455675e9bc6f6f87ad43a2ae32536ec7798f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x819B 26072 bytes
font_01_sfnt_off0000b71a.bin
aa0dbb41d22ad4d2609124a58b96e43ed459162f1eec14425bf13a3f9ebe1775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 9932 bytes

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