Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b3a81a6499c573…

MALICIOUS

PDF

43.4 KB Created: 2020-06-14 14:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7c1e39bb993b9c183bb43a580f8a88 SHA-1: 0f72e77f756603117067ad223d3b21a7909006f8 SHA-256: 65b3a81a6499c57347a85b7bc267b64c4c647a80bfd0dffbbe200567844a8154
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and references to URLs, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://frederickhglloyd.com/uploads/1/3/0/8/130873849/130873849.html#la+comida+worksheet
    • http://jamiehowelleventandphoto.com/uploads/1/3/0/7/130776572/2103756.pdf
    • http://bullockedforlife.com/uploads/1/3/0/8/130814633/fipikovuga.pdf
    • http://naugatuckchamber.org/uploads/1/3/0/5/130588437/160262.pdf
    • http://jameswrightphotography.net/uploads/1/3/0/8/130874565/7003661.pdf
    • http://janakolpenstudios.com/uploads/1/3/0/6/130640110/ropokelexeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zafuwuma.files.wordpress.com/2020/06/kamupijunozagegutaj.pdf
    • https://wadikow.files.wordpress.com/2020/06/83840659868.pdf
    • https://pulonajigulo.files.wordpress.com/2020/06/76866656304.pdf
    • https://lideseka.files.wordpress.com/2020/06/64105203309.pdf
    • https://morixumudiba.files.wordpress.com/2020/06/77478879172.pdf
    • https://vuketuwowi.files.wordpress.com/2020/06/20044723320.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dad.bin
0b93148184328e96857fa02599bb18f4def420c63cc0474f0ae42b375203c7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 11168 bytes

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