Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f2c621a2169b1…

MALICIOUS

PDF

37.7 KB Created: 2020-04-06 15:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef333515696824713d02b827b29ed410 SHA-1: a6360ccc92a575d5a41e58f5194e67929b25555d SHA-256: c37f2c621a2169b16fba02cdb0edb5a898427dceffa8d27fe2f0c752b1eb85d1
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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. No scripts were extracted from this sample, but the sheer volume of external links points to a malicious distribution or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://negentropy.solutions/uploads/1/3/0/6/130639531/130639531.html#poema+asi+soy+yo
    • http://thezenseat.com/uploads/1/3/0/3/130379072/fef02.pdf
    • http://cleanhealthherbs.com/uploads/1/3/1/3/131379650/vutadomakatudutame.pdf
    • http://personalfinancehealth.com/uploads/1/3/0/3/130323091/3056662.pdf
    • http://invictusintel.com/uploads/1/3/0/6/130621591/5bd72c.pdf
    • http://bellagioofnorthville.com/uploads/1/3/0/5/130588595/kazetapufegi.pdf
    • http://electrotech.vip/uploads/1/3/0/8/130815277/6593400.pdf
    • http://741bragghillroad.com/uploads/1/3/0/5/130551461/5a2b601be82a7e7.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_off000068be.bin
c1bbe69ebce652be45fffeba4a7555d711e553e2624d43b9e0784e1b78b352c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BE 8908 bytes

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