Malicious PDF — malware analysis report

Static analysis result for SHA-256 592082dd0d52bb69…

MALICIOUS

PDF

39.2 KB Created: 2020-04-12 17:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1365852aa458341bd8f65a1a42dd5f52 SHA-1: 1a043e4778f9e1e481227ba37e99a51a93ee85d2 SHA-256: 592082dd0d52bb697b190a64ec9f05e696946d29e77c2379bc470279f70726da
94 Risk Score

Malware Insights

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

The PDF document uses a lure related to essay writing to disguise its malicious intent. It contains a large number of external links, many pointing to other PDF files hosted on various domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pencilpenservices.com/uploads/1/3/0/7/130739956/130739956.html#como+hacer+un+ensayo+escrito+a+mano
    • http://nynjoutdoors.com/uploads/1/3/0/2/130288549/nawofedeguro-dogise.pdf
    • http://codyalbertross.com/uploads/1/3/0/5/130545429/fa9148fba842.pdf
    • http://concretesolutionsofoklahomacity.com/uploads/1/3/0/3/130323405/jedibij.pdf
    • http://www.danapowellenergy.com/uploads/1/3/0/6/130621061/1866106.pdf
    • http://ivymobouckcoaching.com/uploads/1/3/0/4/130476798/68383173168e176.pdf
    • http://happytales.online/uploads/1/3/0/5/130547069/zedam.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_off00006f3d.bin
4711dab0b735c981dcf7ccdc8a5ab0ac933e941dc78814505321fe6302069819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 8980 bytes

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