Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2060ef1d69dc7f3…

MALICIOUS

PDF

35.6 KB Created: 2020-06-17 10:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efc6bde9358241f8f80f30bdb4d46c14 SHA-1: 7d160bf371144679f0be50c8bb3eb81c9e66c76f SHA-256: d2060ef1d69dc7f3beccc19f6f4a6f4f41bf52d814f5d2647d02ba605397e2d7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soundsofmars.com/uploads/1/3/1/0/131070187/131070187.html#lg+nb3510a+manual
    • http://inglesidehoa.com/uploads/1/3/0/5/130543545/bf984825f64.pdf
    • http://webmail.straightofftheranch.com/uploads/1/3/0/2/130289179/5f641555a98b.pdf
    • http://mail.heartlandinternet.net/uploads/1/3/1/4/131483255/tofigala.pdf
    • http://academievoorhetleven.nl/uploads/1/3/0/7/130775379/9875615.pdf
    • http://mdfitnessconsulting.com/uploads/1/3/0/7/130740193/1470970.pdf
    • http://gypsylogic.com/uploads/1/3/1/1/131164506/9612294.pdf
    • http://rapidrefillsantacruz.com/uploads/1/3/0/4/130436181/1386049.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fde.bin
43eb79d8ced0f183dea86339c64efa15264c306567d1e4f8e695f582603922aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDE 4820 bytes
font_01_sfnt_off0000602b.bin
d1172e93f0411ce8b84e71adaad89858161b4291fbb95564ae5c932da1b47175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602B 10420 bytes

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