Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc69d1a61e1ee44d…

MALICIOUS

PDF

33.6 KB Created: 2020-04-14 05:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4da205cd6c8411f851f5ba7db40d4db SHA-1: 1383c77b15d629641f6de0ca3666cd2ef48de7fe SHA-256: dc69d1a61e1ee44d229c1f73097c76ab34f05f522362947983104e51d86c3ccf
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text, though heavily obfuscated, contains references to 'Microsoft Excel food diary template' and the authoring tool 'wkhtmltopdf', suggesting a lure to disguise malicious links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 3

  • 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
  • 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://catherfoods.com/uploads/1/3/0/3/130379465/130379465.html#microsoft+excel+food+diary+template
    • http://xp-streich.com/uploads/1/3/0/8/130873820/bb3846c56.pdf
    • http://irishweightedblankets.com/uploads/1/3/0/7/130738996/dumok-reboxe.pdf
    • http://tomdiviny.org/uploads/1/3/0/6/130605122/mezanibega-wafevamugi.pdf
    • http://thecanwhocan.com/uploads/1/3/0/6/130621868/8915121.pdf
    • http://zest4lifemembers.com/uploads/1/3/0/7/130739779/e90e605fc.pdf
    • http://plainstate.org/uploads/1/3/0/3/130313786/a01809.pdf
    • http://adlerelitepc.com/uploads/1/3/0/5/130590366/rusam-nitovoj-jelimu.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_off00005d37.bin
b8735db2ac6e316601e6540c263ade74de5ed7d00190e4a9fa6ab8498cc18fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D37 7880 bytes

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