Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dfeaf6289d2c6c…

MALICIOUS

PDF

43.1 KB Created: 2020-04-22 17:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1d57161d41d81a5e7ba8307aa2b66bb SHA-1: 5994a1b67db468b7b4a98b65185159c946bc990e SHA-256: 45dfeaf6289d2c6c3165e33c9728461f44db5c333f74d52b2b65f37e93bac652
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results. The document body, though partially corrupted, suggests a lure related to medical guidelines. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tapthematrix.net/uploads/1/3/0/8/130814416/130814416.html#colon+cancer+nccn+guidelines+2018
    • http://greenrootsgourmet.com/uploads/1/3/0/7/130775911/wolitipetosefovu.pdf
    • http://gortizlimpiaduriayventa.com/uploads/1/3/0/6/130604979/bd8473dc91.pdf
    • http://marieandrees.com/uploads/1/3/1/4/131406843/zatonetewemaz_powusoweti_bujalomi.pdf
    • http://pogegraphicdesign.com/uploads/1/3/0/7/130776745/pibijedimosi.pdf
    • http://computerissuessss.com/uploads/1/3/0/7/130776415/6780039.pdf
    • http://camplakeoutfitters.com/uploads/1/3/1/4/131437676/pugosimisivow.pdf
    • http://computerissuessss.com/uploads/1/3/0/7/130776415/6780039
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076df.bin
c82817042e5834fd8dbd4001b3d31ef8f75662b83224356c623f95af851f7b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DF 8376 bytes
font_01_sfnt_off00009744.bin
78116880e9c902c31767bfa12a9ff84ada309181a52ab1aa29cdf6fbfe115b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 2600 bytes

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