Malicious PDF — malware analysis report

Static analysis result for SHA-256 844115c8db756cf0…

MALICIOUS

PDF

33.5 KB Created: 2020-04-28 18:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a51ac5e1668cd4f0179f890a3266575 SHA-1: fa0cdcd5c0e820e89c22fd08d13e9701ca50e895 SHA-256: 844115c8db756cf067e99eea806b42340ee96a80d731a373a94844732622015d
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xocobean.com/uploads/1/3/0/8/130813782/130813782.html#incidence+rate+questions+and+answers
    • http://ronsbest.org/uploads/1/3/0/2/130291713/87e00.pdf
    • http://h2osafebaby.com/uploads/1/3/0/2/130287936/3293180.pdf
    • http://renaissancefour.com/uploads/1/3/0/4/130488920/7e968f6a.pdf
    • http://gondaragency.com/uploads/1/3/1/8/131856034/lusifudesivinonol.pdf
    • http://3southernsisters.com/uploads/1/3/0/7/130739532/gijarosa.pdf
    • http://hand-brainlab.org/uploads/1/3/0/2/130291724/givitajivom-pifiji-rilamavoruziwip-busopota.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_off00005d31.bin
c89e2b83a07dc40f19e6e6d7c16d79459df53ee47438ddf372f70ca05cea9c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D31 7408 bytes

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