Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d52195457c68d8…

MALICIOUS

PDF

32.8 KB Created: 2020-04-15 00:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cc23239e5c95ef9e2ddf909ceb5bc38 SHA-1: 6b567f5c6ba66e476962c5d85d351042043048d9 SHA-256: 11d52195457c68d8b98899174378023d0b4726c300a38ea4f97acd63b7dfeb15
96 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm of external PDF documents, with one URL pointing to a .html file that mimics a pharmacy prior authorization form. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the PDF content suggest a phishing or redirection attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://shipshapeworks.com/uploads/1/3/1/3/131381761/131381761.html#caresource+kentucky+pharmacy+prior+authorization+form
    • http://cannabellacanada.com/uploads/1/3/0/7/130738960/nikanagalejujub.pdf
    • http://dsflynets.com/uploads/1/3/1/6/131606208/fudopoxenililageviv.pdf
    • http://chanceandrob.com/uploads/1/3/1/4/131437464/zapamu-wijirumalu-luzebodanaxoraf.pdf
    • http://chule.es/uploads/1/3/0/6/130639364/koruxefusenu_lobawawakugeg_pajaluvoxono.pdf
    • http://hattitudeproductions.com/uploads/1/3/1/3/131398083/kazur-gogavofepumu.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_off000056f0.bin
06cd0439825b5682ba68cb6714961efd6f993b436993a587d40c6935fde2e3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F0 8500 bytes

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