Malicious PDF — malware analysis report

Static analysis result for SHA-256 0765f77e5967176d…

MALICIOUS

PDF

37.7 KB Created: 2020-04-08 13:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec61896df575ff96f97b999d00770296 SHA-1: 47f31267edffbe638845c1ae785a1a98aeb2e55c SHA-256: 0765f77e5967176de072d2f4c64e2e8ad0c038a4c71d649a974ffcf8a9142572
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to potentially malicious websites, possibly for phishing or malware distribution.

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://blackhawbuilders.com/uploads/1/3/0/6/130605315/130605315.html#cuales+son+los+indicadores+de+ph+naturales
    • http://pcucustomsbrokerinc.com/uploads/1/3/0/6/130605198/lalire.pdf
    • http://tickettoyournextdestination.com/uploads/1/3/1/4/131408930/6222081.pdf
    • http://snapshotdrones.com/uploads/1/3/1/4/131454345/7a8febd52e.pdf
    • http://kasselov.no/uploads/1/3/0/3/130323172/35bbca9ccee557a.pdf
    • http://cunaves.com/uploads/1/3/0/6/130620228/9498385.pdf
    • http://fmscfs-support-4-me.org/uploads/1/3/0/2/130270993/4cca36e0fc8984.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_off00006854.bin
ec4f774357ceeca24d4d9a632b115c4ad1742f78c7f9c835e7f56eeda1ff2ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6854 8852 bytes

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