Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3f34e030eb5045…

MALICIOUS

PDF

45.6 KB Created: 2020-04-09 07:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0e70c5438e531e7c00916234a6163a7 SHA-1: e5b48f26dec18dd24caba337ffdddbfc7d5d7975 SHA-256: ba3f34e030eb50450cf68ac2fe5408c91d9691125ae93b7e18ad4a27300e2096
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is characteristic of SEO spam or a link farm designed to distribute malicious content or improve search engine rankings for undesirable sites. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as a primary attack vector. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific intent beyond link distribution.

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://boa-beauty.com/uploads/1/3/0/8/130813646/130813646.html#cuidados+de+enfermeria+en+salud+mental+y+psiquiatria
    • http://gfwcrandolphjrs.org/uploads/1/3/0/6/130603961/9e4a5.pdf
    • http://reshafe.fr/uploads/1/3/0/7/130738903/fejutuvikepolurerix.pdf
    • http://lashtowncleveland.com/uploads/1/3/0/7/130775715/7f3fed838.pdf
    • http://dementeddiva.com/uploads/1/3/0/5/130539102/0445b.pdf
    • http://mail.pinegroveumc.com/uploads/1/3/0/7/130775395/mirifuj.pdf
    • http://straighterpath.com/uploads/1/3/0/7/130775013/0730b662b.pdf
    • http://casadeoromassage.com/uploads/1/3/0/6/130639741/4743651.pdf
    • http://rigarden.com/uploads/1/3/1/4/131438233/29945f.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_off000088b3.bin
1d51cfe18e58c5969d4ebfe916f418e0f3629df787e051a49a53fb3c45fedebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B3 8528 bytes

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