Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b355d2988c5b84…

MALICIOUS

PDF

32.6 KB Created: 2020-05-31 10:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d704e4cc825e691c17e7b2b4201839ec SHA-1: ff1bb84df2fcf4b9b651f8e34234e46fe9a76f4a SHA-256: 43b355d2988c5b8405c56e167afaca831aa51896d1c7cd953f371eb3f751b33a
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The presence of numerous numeric-slugged PDF URLs suggests an attempt to manipulate search engine results or direct users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yymwk.slpny.com/uploads/1/3/0/5/130589182/130589182.html#aula+virtual+ies+jose+luis+sampedro
    • http://ottawafamilyfootclinic.com/uploads/1/3/0/5/130547552/tizeja.pdf
    • http://superiorhomeflooring.com/uploads/1/3/0/7/130739682/7191117.pdf
    • http://fionajanewalsh.com/uploads/1/3/0/9/130969795/pusaperifo.pdf
    • http://sugarlandpremierroofing.com/uploads/1/3/0/3/130323526/tukogenerifa.pdf
    • http://megandownes.studio/uploads/1/3/0/3/130323647/zutul-rosatuwa-nakedegol-tatej.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_off00005089.bin
0bdd461162ac6336fcc2d3def1aa80e12cc63a90c7ee5b4616c54cf8208acb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5089 11672 bytes

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