Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e461ff4c76b2ca7…

MALICIOUS

PDF

46.0 KB Created: 2020-04-10 23:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a70b76ba99c4f1486ebc17d245944993 SHA-1: 32d07defd1d338963b5c1a4ec064a2b97a063929 SHA-256: 5e461ff4c76b2ca72a661c9876d5cc28e90b72ef2ec8b293634f6bcb6e9fdbf1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or a distribution mechanism for further malicious content, potentially leading to a phishing or malware download stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://juliejesternewman.com/uploads/1/3/0/2/130272092/130272092.html#djamila+ribeiro+lugar+de+fala+pdf
    • http://synecticteaming.org/uploads/1/3/0/3/130312914/01a2d.pdf
    • http://matherleap.com/uploads/1/3/0/5/130589009/sirufokel.pdf
    • http://uniteyu.com/uploads/1/3/0/6/130620909/239cd1aec8f.pdf
    • http://hairbytiananichole.net/uploads/1/3/0/6/130621411/48d4cd3cc1ad.pdf
    • http://theprodigalsonsoupkitchen.org/uploads/1/3/1/4/131406248/4878fa091e38b.pdf
    • http://parentingwithmindfulness.com/uploads/1/3/0/3/130313274/ae7a9b9d2.pdf
    • http://jaydconsulting.net/uploads/1/3/0/6/130604233/8b3e7d1db848fe1.pdf
    • http://citywidepainting.ca/uploads/1/3/0/5/130550948/1575985.pdf
    • http://coastalquestvr.com/uploads/1/3/0/4/130435594/gebiruzizozaxu.pdf
    • http://bytecubed.io/uploads/1/3/0/9/130969566/depim_wonorinijof_rikatureza_juxadorize.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_off000088b1.bin
ca3159e250ef092ade3eccff54d7c0b497610c65ece8fd2baa69b8e54eedf609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B1 10232 bytes

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