Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70ef7a1831b8662…

MALICIOUS

PDF

40.4 KB Created: 2020-04-04 12:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5c9e005155005bfdd8090e70c5d9269 SHA-1: 80081109320f7b9130657ba450912f5c7b7e4d43 SHA-256: c70ef7a1831b86622eee85d37e68792cce045fdda3549f91d18eff6e2099e861
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but also includes the URL http://stylesilk.it/uploads/1/3/0/5/130588291/130588291.html#oxxo+mision+y+vision, which is one of many similar links pointing to external PDF files. This suggests a link farm or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://stylesilk.it/uploads/1/3/0/5/130588291/130588291.html#oxxo+mision+y+vision
    • http://intermoda-pm.com/uploads/1/3/0/3/130312924/2772561.pdf
    • http://modernhomeentertaining.com/uploads/1/3/0/7/130776801/wanupilemalowof.pdf
    • http://jlrenobation.com/uploads/1/3/0/4/130476921/4271959.pdf
    • http://scienceofstory.net/uploads/1/3/0/8/130874124/lefutumovorofoxutida.pdf
    • http://yaichisu.dev/uploads/1/3/1/0/131069753/62fd39b5b9f.pdf
    • http://kellyskorneronline.org/uploads/1/3/0/5/130590777/6191f8cba.pdf
    • http://glynisfullwood.com/uploads/1/3/0/8/130873984/gojaxukabik-buwiko-mixisujalu.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_off000072b8.bin
edf1b3fd68e35c08cb68d81065c2ac4634ff9cac7fb5bdaeae935fa4a7b4ad81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B8 9332 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.