Malicious PDF — malware analysis report

Static analysis result for SHA-256 979f2d8fad614210…

MALICIOUS

PDF

42.6 KB Created: 2020-05-03 15:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29f10c3bca7153e9bade3ddd7a0f56f1 SHA-1: 2ba2f9ea6ddc0819d46c0259434f494e758fa7be SHA-256: 979f2d8fad6142105c2e6c7002537a19eb5b28c69f2e66848b90533d2fcbc2c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which are hosted on newly created domains and point to PDF files. This behavior is indicative of a link farm used to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'Austrian visa d form', suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fletcherinteriors.info/uploads/1/3/0/5/130539316/130539316.html#austrian+visa+d+form
    • http://nowaysir.com/uploads/1/3/0/7/130739625/5280763.pdf
    • http://timothyrstanley.com/uploads/1/3/0/7/130775735/cb94bfe114.pdf
    • http://misswanb.com/uploads/1/3/0/4/130435499/3fa0a29.pdf
    • http://ssnerdology.com/uploads/1/3/0/5/130543207/narowezaf-rejig-katokulidad-kefaboka.pdf
    • http://keyplanningsolutions.com/uploads/1/3/1/3/131398234/mavubedidora.pdf
    • http://medimat.org/uploads/1/3/1/6/131606809/79f6af0c13fc6f0.pdf
    • http://thevisionagency.org/uploads/1/3/0/5/130588405/63789.pdf
    • http://nowaysir.com/uploads/1/3/0/7/130739625
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00007b72.bin
72b662f6fe76511cac28287a49ab5395746524e40e22714a29c4571d603fe52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 10968 bytes

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