Malicious PDF — malware analysis report

Static analysis result for SHA-256 751e552bccb53f70…

MALICIOUS

PDF

33.9 KB Created: 2020-04-18 04:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 975eab18e493db9d571f586a0b7800f2 SHA-1: 254ebd4b0f6c3ea7f0205c1e4e313ed915473b13 SHA-256: 751e552bccb53f70380882dbb2b0c1fcdfcec5f4617b34c0ae40e23838b7d1d2
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains references to 'petty cash report format in excel' and URLs that are likely intended to lead the user to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is a delivery mechanism for further compromise.

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://palosislamiccenter.org/uploads/1/3/0/7/130776476/130776476.html#petty+cash+report+format+in+excel
    • http://httpspartnerwithangelr.info/uploads/1/3/0/5/130543239/fisarakafit_begijija_zubigi.pdf
    • http://becausecommunicationsllc.com/uploads/1/3/0/6/130622047/xudimaf_padowuwoti_jogumanuwawafep_jokurew.pdf
    • http://thecatchateau.com/uploads/1/3/0/3/130312953/31c87396bb.pdf
    • http://snapshotsatl.com/uploads/1/3/0/5/130550708/287403.pdf
    • http://temanbaiksukoharjo.com/uploads/1/3/0/4/130483331/wuburolit_buvorurer.pdf
    • http://donaldcrowell.com/uploads/1/3/1/6/131636841/4293235.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_off00005e30.bin
a93e682a6fdf41712eef3406569c7a5e94e7f0d7c58c48328a72c520922a57fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E30 7648 bytes

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