Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cbf82a8fd96f39…

MALICIOUS

PDF

36.8 KB Created: 2020-03-10 07:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd77d3ec20b41373b3c9f7b4c909089e SHA-1: 68ac1a9a1d50f9e2eb5e4ffbd36c158ce8af7095 SHA-256: 38cbf82a8fd96f39141c7efdab1234b8a450ad95f05ab29cc20bc20a8f0e24cb
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, likely intended to drive traffic or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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 http://x0689541xstreamtravel.xsideas.com/uploads/1/3/0/6/130605390/130605390.html#2d+animation+in+blender+pdf
    • http://djfullhouse.com/uploads/1/3/0/5/130588195/gawulo.pdf
    • http://atotulsa.com/uploads/1/3/0/3/130379246/dikag.pdf
    • http://twinlakesimprovement.org/uploads/1/3/0/7/130775458/walewujewu-rebokijo.pdf
    • http://eostaxprep.com/uploads/1/3/0/2/130289809/nebuj.pdf
    • http://antechprojects.com/uploads/1/3/0/7/130775832/jotiko-kavutero-gagexapo-bunipedadika.pdf
    • http://vixenpromakeup.com/uploads/1/3/0/4/130488583/xagov.pdf
    • http://www.jordisglamdivas.com/uploads/1/3/0/5/130539714/1554061.pdf
    • http://inventureconsulting.net/uploads/1/3/0/6/130604414/figexugo.pdf
    • http://www.cookiesandcrystals.com/uploads/1/3/1/0/131070171/bedemabem.pdf
    • http://hipsterpelicancomics.com/uploads/1/3/0/6/130639084/vorir.pdf
    • http://motorpetroleum.com/uploads/1/3/0/5/130550836/3146546.pdf
    • http://manantiallatino.net/uploads/1/3/1/0/131070293/difajafo.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_off0000675b.bin
e515779673e1b165f567b29ab8c9227a839a9a084865c37d6c7b06776c3bcfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 8016 bytes

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