Malicious PDF — malware analysis report

Static analysis result for SHA-256 d572a10d99cea871…

MALICIOUS

PDF

29.4 KB Created: 2020-04-07 22:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25ccd9554047e574362efbd1f29af7f8 SHA-1: a2d74a85235c4d765711b8683f000faabb17afb3 SHA-256: d572a10d99cea871b051c1231689f5225d1720888771076a0164dd0852ad2074
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious with a high confidence score. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The document body contains garbled text along with some of the URLs, suggesting it's designed to appear as a legitimate document while serving as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sheworksavl.org/uploads/1/3/1/4/131407067/131407067.html#libros+de+balistica+pdf
    • http://advancedpaintpreparation.net.au/uploads/1/3/0/6/130603946/modorelag.pdf
    • http://profloorskc.com/uploads/1/3/0/4/130435929/2010039.pdf
    • http://almahruqicars.com/uploads/1/3/0/6/130604644/bfbbc85a35.pdf
    • http://properpuppiesonline.com/uploads/1/3/0/6/130639509/d3dc1118c7.pdf
    • http://rialtofood.com/uploads/1/3/1/0/131069987/bevanuga.pdf
    • http://lanniesneighborhood.com/uploads/1/3/0/7/130738887/wizotujedu.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_off00004e5e.bin
99be0d54a909e386401afb71ac4715df6967a8f59f95eff3bed772234c5bef22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5E 6920 bytes

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