Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5797199a6b4b593…

MALICIOUS

PDF

37.3 KB Created: 2020-04-04 15:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d710ed978b7f7457d011d2ddcc84ea2c SHA-1: 57616b704de47007ad6374e32deb08c406f1fada SHA-256: d5797199a6b4b5935e0bb345b3b8813206aca64f6ecd968c6d2babf9a841711b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF file contains a large number of embedded external links, identified as a PDF link farm. The ML classifier strongly indicated maliciousness. The primary function appears to be directing users to a multitude of other PDF documents hosted across various domains, likely for SEO manipulation or to serve as a distribution point for further malicious content.

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://christinafriedle.org/uploads/1/3/0/9/130969438/130969438.html#general+malaise+icd+10+code
    • http://scsc.info/uploads/1/3/0/7/130740244/zopofeduk.pdf
    • http://theperfectblendcatering.com/uploads/1/3/0/6/130621557/fefexefomaxumux.pdf
    • http://thompsonhomeservicesllc.com/uploads/1/3/1/4/131437425/7004585.pdf
    • http://boostersnetwork.com/uploads/1/3/0/4/130436307/mukumele_guteju_ramimov.pdf
    • http://carolynmartinshaw.com/uploads/1/3/0/8/130813764/1c1c6154c5.pdf
    • http://attazphoto.com/uploads/1/3/0/4/130476859/9900082.pdf
    • http://maceratateatro.it/uploads/1/3/0/5/130588845/vixunitolebe.pdf
    • http://gracehonduraskids.org/uploads/1/3/0/2/130270986/zoxubejobaw.pdf
    • http://jonestownhousepainting.com/uploads/1/3/0/2/130272381/6732365.pdf
    • http://tiffanybeaudin.com/uploads/1/3/1/4/131410479/litikigowepak-fowebobe-dudumududaxa-xisukop.pdf
    • http://tadministramos.net/uploads/1/3/0/5/130588532/volimimobomanakat.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_off00006c40.bin
5c309247459e61fb321197541ec6300401dad8634de3259f7ee9f78676c109c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 7264 bytes

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