Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe198db4bc37278…

MALICIOUS

PDF

48.9 KB Created: 2020-04-14 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36cdf5a03c8c44af95892a08693d8a79 SHA-1: 78e7a0a554330340a774f0d7e04ad6e6f9003b0c SHA-256: cfe198db4bc372787fb4c83ac2750c4b8243abb766be45904bef0a7e998b34fd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, http://areafest.com/uploads/1/3/1/4/131408245/131408245.html#reformat+javascript+code, is embedded within the document body and suggests a JavaScript redirection or lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO poisoning or a phishing lure through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://areafest.com/uploads/1/3/1/4/131408245/131408245.html#reformat+javascript+code
    • http://sisjogolfklubb.com/uploads/1/3/1/4/131437515/2620232.pdf
    • http://havanawaytransportinc.com/uploads/1/3/0/2/130289763/viraxapiliwibur.pdf
    • http://harborshorespaddlesports.com/uploads/1/3/0/4/130435909/mejix.pdf
    • http://bacmed.net/uploads/1/3/1/4/131438571/15cf4d.pdf
    • http://djsecom.com/uploads/1/3/0/6/130640091/9cfed3.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_off0000857b.bin
4050c7d1363714920bef07ec2fe573ccea5e092865ca79ba1d23cb1264953cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857B 9524 bytes
font_01_sfnt_off0000a8bc.bin
eec7b7b1b131f03f2eddfdcc087f09c27cdaebcb3da3a6d0c6be704484c2ed6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BC 4652 bytes

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