Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8deacbb8affc6c0…

MALICIOUS

PDF

32.6 KB Created: 2020-05-17 20:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ea39270ec793ed3a7fe59ad5abae6b SHA-1: f934806346c020a413bc7e8dcfda626868c71348 SHA-256: f8deacbb8affc6c0abfa198cc173a347c17cff8b4d1b088afc7f13050b8dfeca
94 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 similar domains. This pattern is indicative of a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://frankyjay.net/uploads/1/3/0/6/130604382/130604382.html#formation+agent+d%2527+escale+lyon+gratuite
    • http://youthtensils.com/uploads/1/3/0/6/130640013/115704.pdf
    • http://unblanket.com/uploads/1/3/1/3/131380066/578ae9dd939.pdf
    • http://danburdettretirement.com/uploads/1/3/0/2/130270873/wusanebalaxenuvinewe.pdf
    • http://dazzl.net/uploads/1/3/1/0/131070771/zuzatu-damubafojuwof-forip.pdf
    • http://thenaturalmane.shop/uploads/1/3/0/7/130739584/noxakavodad.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_off00005248.bin
84210266cf564d8eb73b347d0b40d1b8ea3654a16ce31d1f935d0d27669fdabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5248 11752 bytes

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