Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c14e51eef80d2b…

MALICIOUS

PDF

36.1 KB Created: 2020-04-12 16:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0f28e357f87ee7a9e5c6952a8e1f257 SHA-1: 50f8f767edc177e1b702e4160d3caf07a9a999c9 SHA-256: 40c14e51eef80d2b38083e0865c88c7949112f1dfae37d9ede31356770ebd110
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDF files on unrelated domains, indicating a link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting the document's primary purpose is to redirect users to potentially harmful content.

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://auniqueadventure.org/uploads/1/3/0/7/130738790/130738790.html#sesiones+de+educacion+fisica+secundaria+2019+minedu
    • http://escala-activewear.com/uploads/1/3/0/6/130639824/magopenexabezirune.pdf
    • http://sotopressurewashingandpainting.com/uploads/1/3/0/7/130740455/jopusa.pdf
    • http://storefrontsafety.com/uploads/1/3/0/6/130621220/395458e.pdf
    • http://spirious.com/uploads/1/3/1/4/131407734/nukaf_naloson_gojasaduwiza.pdf
    • http://touch-for-life-massage.com/uploads/1/3/0/5/130546136/4898475.pdf
    • http://mobileesthetics.net/uploads/1/3/0/7/130776539/7989713.pdf
    • http://rfucc.org/uploads/1/3/0/5/130543169/naxefutipu-badaja.pdf
    • http://mobileautocare.org/uploads/1/3/0/7/130739029/4675860.pdf
    • http://abbeysowick.com/uploads/1/3/0/5/130588865/302cf9d79d0683.pdf
    • http://seekingsaul.com/uploads/1/3/0/5/130590142/setomijemufefix.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_off000061df.bin
1663f558619dc3bae8985f3f2d10ad0b59f2089c23d56c00f578c94552248842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 9536 bytes

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