Malicious PDF — malware analysis report

Static analysis result for SHA-256 580b37e1afe53247…

MALICIOUS

PDF

37.5 KB Created: 2020-05-23 14:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40abfc73a6dabcd3d34ca9b04a52574 SHA-1: 29f56bcb12fc75b3fcd813b8dbeab70b13d30f47 SHA-256: 580b37e1afe532472ed1bd7043cc6cf3f53117a8684bddbe7421faf6ed348d09
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links suggests a coordinated effort to direct users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://adhere2care.net/uploads/1/3/1/6/131636746/131636746.html#ejercicios+de+conjuntos+para+ni%25C3%25B1os+de+primer+grado+de+primaria
    • http://jonnyessex.com/uploads/1/3/0/6/130621803/gokawubexuz.pdf
    • http://rethinkorganics.ca/uploads/1/3/0/4/130483194/f748274e.pdf
    • http://dashdesignscomo.com/uploads/1/3/0/4/130476442/gesijifafogufo.pdf
    • http://bestcoastconsultinginc.com/uploads/1/3/1/3/131382373/0a555603d1b2.pdf
    • http://adelaideandchase.com/uploads/1/3/0/4/130476242/2059622.pdf
    • http://lapocketphotographer.com/uploads/1/3/0/6/130620783/900a7a577c.pdf
    • http://leonconsulting.net/uploads/1/3/0/7/130739629/17ecd6.pdf
    • http://lambentelectric.com/uploads/1/3/0/3/130323091/4155651.pdf
    • http://mccutiescreations.com/uploads/1/3/0/3/130313093/3779541.pdf
    • http://ftmobile.com/uploads/1/3/1/6/131606203/7629765.pdf
    • http://theinternationalcenterforreikihealing.com/uploads/1/3/1/4/131453259/7383282.pdf
    • http://travauxdedition.com/uploads/1/3/0/6/130639861/230726.pdf
    • http://brand-usapple.com/uploads/1/3/0/6/130639950/vagokez.pdf
    • http://haarpflege-fuer-lange-haare.at/uploads/1/3/0/3/130379457/030029.pdf
    • http://sarapercival.net/uploads/1/3/0/3/130323210/878748.pdf
    • http://entretiendeneigementolly.org/uploads/1/3/1/4/131482995/4627913.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_off0000636b.bin
9204528204911f4b76539c84f6ce1f73db2867d0afac15a1823517d7eb28ba8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 11152 bytes

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