Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a2bf5606d807e1…

MALICIOUS

PDF

37.9 KB Created: 2020-04-13 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4abad7c3a96642caa907e61b81c5a09 SHA-1: 696e264d4d6df49c39128dfa2f27724ce12d4fcf SHA-256: 78a2bf5606d807e179ef4b6e37d5c450b49e151f32e2111fe1250c6f412064b3
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm or SEO spam. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://reboundat.com/uploads/1/3/0/5/130539108/130539108.html#ejercicios+de+matematica+multiplicacion+de+dos+cifras
    • http://biosourceconsultinggroup.com/uploads/1/3/0/5/130551249/fugilemolisapixe.pdf
    • http://unapologeticnails.com/uploads/1/3/1/1/131164456/silefib_wujalalux_pixotavu_fumorefarafipev.pdf
    • http://thunderous.nl/uploads/1/3/0/7/130739573/00b4995b4d70d78.pdf
    • http://deepcleaningprofessionals.net/uploads/1/3/1/3/131383319/vosigi.pdf
    • http://jasonhedtler.com/uploads/1/3/1/4/131408353/leraxu-nalox-solazoxetawukam.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_off00006a9d.bin
fd8f5faaf7fca87e68fd6867374906a0a0c679b44c5b87ef78fe1e87d76a038c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9D 9108 bytes

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