Malicious PDF — malware analysis report

Static analysis result for SHA-256 b114917f8c8af4b0…

MALICIOUS

PDF

55.2 KB Created: 2020-04-28 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cfe6b8f028b72f834d289e4bc5a1247 SHA-1: 1175e5fbc5609216e06d789151e100bff8e6864a SHA-256: b114917f8c8af4b0c1fa4a83a9299f5842815d5fb761cc96f7e28c052d903cb4
94 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier with high confidence. It contains a large number of external links, characteristic of a link farm or SEO spam, designed to direct users to other potentially malicious PDF files. The document body text is obfuscated but contains a reference to 'Behavioral based interview questions and answers pdf', suggesting a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://shuaigroup.org/uploads/1/3/1/8/131859993/131859993.html#behavioral+based+interview+questions+and+answers+pdf
    • http://inletmarketing.com/uploads/1/3/0/3/130323390/jukosiroli-nuboroxu.pdf
    • http://writeaboutmusic.com/uploads/1/3/0/4/130489131/kifaditogidajogori.pdf
    • http://propertyexcellencemoree.com/uploads/1/3/0/2/130289749/9332385.pdf
    • http://paths2parenting.com/uploads/1/3/0/6/130604871/b6281db4e.pdf
    • http://giftboxme.com/uploads/1/3/0/8/130874198/kerujexalodakazi.pdf
    • http://spearmint.studio/uploads/1/3/0/6/130639227/2513402.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b94.bin
3875aac4c7a5b409d2ce345857e27feaf34be4a7f6acfae1d97a9f5d680e60bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B94 7588 bytes
font_01_sfnt_off0000b93b.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 16204 bytes

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