Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e0724aba4deda…

MALICIOUS

PDF

51.3 KB Created: 2020-04-09 23:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9f62d80ba84b3eff9fce279ba2fee83 SHA-1: 58e3a1f910428bb334f180aef48c931b98126794 SHA-256: c73e0724aba4dedad4d1017dde48d1ef9b98a7d11785f61c23ab28885e131b2a
92 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://carolinawellness.center/uploads/1/3/1/0/131069987/131069987.html#a+brief+history+of+seven+killings+pdf
    • http://scratchncolor.us/uploads/1/3/0/6/130605291/lexojixewitu-fegavodikap-furatewadi.pdf
    • http://dupreez.space/uploads/1/3/0/7/130739867/sevumafuputed.pdf
    • http://mibrews.org/uploads/1/3/0/7/130738962/9465382.pdf
    • http://amywoodsbooks.com/uploads/1/3/1/4/131407045/nuwoles.pdf
    • http://sproosservicing.com/uploads/1/3/0/4/130491444/fuzadub_nabonepesoviw_rusowurutef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009738.bin
78f576439e28012169a7b4370669c11204759d4b89383e8c4e05e1cb2878a655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9738 8524 bytes
font_01_sfnt_off0000b820.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 2484 bytes

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