Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fff4e8e59cbfadb…

MALICIOUS

PDF

34.0 KB Created: 2020-04-24 10:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ca3e520db86e938862e5ff870c0a836 SHA-1: 88e976fdf7a21fd49843a70763976273b0cf1eba SHA-256: 3fff4e8e59cbfadba5d94a287659d3cc41723f137859691aec1fecd665384290
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to artificially boost search engine rankings. The heuristic 'PDF_SEO_LINK_FARM' indicates this behavior. The embedded URL 'http://doseofcourtblog.com/uploads/1/3/0/4/130483821/130483821.html#brightness+control+windows+10+software' suggests a lure related to system software, likely to direct users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://doseofcourtblog.com/uploads/1/3/0/4/130483821/130483821.html#brightness+control+windows+10+software
    • http://perham.services/uploads/1/3/0/3/130313220/lowamojalal.pdf
    • http://jcolewy.com/uploads/1/3/0/7/130738825/5725996.pdf
    • http://michelledburks.com/uploads/1/3/0/4/130436426/2381967.pdf
    • http://sandpiperart.org/uploads/1/3/1/4/131407592/1e6ccd.pdf
    • http://microphonistbeats.com/uploads/1/3/0/6/130620467/b3388afe4.pdf
    • http://chapter412.com/uploads/1/3/0/3/130324191/9076042.pdf
    • http://assesip.com/uploads/1/3/1/3/131380212/e873149d588.pdf
    • http://assesip.com/uploads/1/3/1/3/13138021
    • 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_off00005d8e.bin
0b36ffe277c1a0c1b4a8b881db84f5359ddd19d5dc16324cf8e03b90cac05e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 7392 bytes

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