Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75bb8a7d5d542da…

MALICIOUS

PDF

37.9 KB Created: 2020-03-08 04:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b3f960422b66ca32a8db2c6f0b85c149 SHA-1: 232c00bd9b15ceb3c43aee71d2433d7e328b3e4f SHA-256: c75bb8a7d5d542da1b7a0b01d4f1e9702df55c7268f7ed40bdd9b13775a38831
92 Risk Score

Malware Insights

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

This PDF document contains a large number of external links to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links points to a content distribution or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://v9zhr.slpny.com/uploads/1/3/0/7/130739802/130739802.html#bronfenbrenner%27s+ecological+systems+theory+chronosystem
    • http://hotellable.com/uploads/1/3/0/6/130622077/8192131.pdf
    • http://www.excitingmarketingjobs.com/uploads/1/3/0/6/130621160/befobabib-gixazege.pdf
    • http://cairobritishcollege.com/uploads/1/3/0/2/130272877/xusuwuf-vavixijogi.pdf
    • http://hostmaster.clarencecoastdbclub.com.au/uploads/1/3/0/8/130813804/supamoto-supemifeji.pdf
    • http://slimyapple.com/uploads/1/3/0/5/130544089/wedex-vuwuk.pdf
    • http://sonicplaygrounds.com/uploads/1/3/0/2/130287283/33478858232ca.pdf
    • http://desatascosmaresme.com/uploads/1/3/0/4/130488940/vaguboxunibof.pdf
    • http://alexcharlier.com/uploads/1/3/0/2/130288301/2651387.pdf
    • http://andrewleepost.com/uploads/1/3/0/7/130776174/mukasesunabuwed-godasep-rawedixi.pdf
    • http://peninsulaprintmakers.com/uploads/1/3/0/7/130776676/8565778.pdf
    • http://listmn.org/uploads/1/3/0/7/130775643/suzovuloxixemosofix.pdf
    • http://angiecoxcounseling.com/uploads/1/3/0/5/130545421/gofosijada.pdf
    • http://portfoliofrancaisdejj.com/uploads/1/3/0/8/130874377/ribugadesifu.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_off00006a31.bin
1c890706ba74836e9df5e2e237ed786869579e091bef0ae93a33178560478457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A31 8240 bytes

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