Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ea8a8f057237b7…

MALICIOUS

PDF

44.5 KB Created: 2020-04-08 15:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d811dbf51acca2e71e4be711f23ed273 SHA-1: 4959f5b11616c88f62e30100b92511f11fdfc1d2 SHA-256: b9ea8a8f057237b75d1ad204d300105fd6a2592365b221898dd06a64f0dd3105
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence as malicious. It contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The document body itself is largely unreadable, but the presence of numerous external URLs is the primary indicator of malicious intent.

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://forkeepsbooks.co/uploads/1/3/0/6/130604799/130604799.html#fisiopatologia+del+sindrome+de+rarefaccion+pulmonar
    • http://mahmudhamdiassociates.com/uploads/1/3/0/7/130776571/64313f49.pdf
    • http://ironsmokedistillery.biz/uploads/1/3/1/4/131454012/e5d7dfb30388ef6.pdf
    • http://xaolon.org/uploads/1/3/0/7/130739450/bf31f0fb5fe0.pdf
    • http://coldfirellc.com/uploads/1/3/0/9/130969804/31a758b81a8.pdf
    • http://wmscomputing.com/uploads/1/3/1/4/131407029/xonin_vizibixure.pdf
    • http://berksdogtraining.org/uploads/1/3/1/4/131452935/kimemefe.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_off0000834c.bin
9d49ccafdb3a0a7eded330807550eb96158d2a91a1528f0ef0975238ab633770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834C 9552 bytes

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