Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a62317e6c3424c…

MALICIOUS

PDF

35.8 KB Created: 2020-04-14 13:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa9a3aeb411eb48f35a027a21fb1e8df SHA-1: 15a509d80d1688620f26902a4ffd51017007c434 SHA-256: f8a62317e6c3424c5b886bb1071a8da0be35804f69286ef98198599f9164966a
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://amandakayser.com/uploads/1/3/0/7/130775970/130775970.html#divisibility+rules+worksheet+grade+6
    • http://maranathabtr.org/uploads/1/3/0/5/130538986/6bd67801f.pdf
    • http://christopherabeel.com/uploads/1/3/0/2/130288986/lisoweselifuligikir.pdf
    • http://stillchampion.net/uploads/1/3/1/3/131384602/62b797f532b5f3.pdf
    • http://aquarushwatersportstn.com/uploads/1/3/0/6/130621306/5cb579.pdf
    • http://contacthomefirst2017.com/uploads/1/3/0/5/130588318/medumabapatuna.pdf
    • http://traceydilley.com/uploads/1/3/0/4/130483864/gulowolawuni.pdf
    • http://redagavelawn.com/uploads/1/3/0/6/130621116/72d721f62.pdf
    • http://bodytuningnmt.com/uploads/1/3/0/6/130604309/9717880.pdf
    • http://tinyspaces.de/uploads/1/3/0/5/130542781/zosejojinaxoliv_remobubegib_suwojugudotamuf_raxuxumetope.pdf
    • http://taoradionetwork.com/uploads/1/3/0/2/130272266/bepetebesepe.pdf
    • http://beebrighttutoring.com/uploads/1/3/1/4/131483453/1432512.pdf
    • http://myopoa.com/uploads/1/3/0/9/130969884/9695750.pdf
    • http://washitallcastillery.com/uploads/1/3/1/3/131384544/9275789.pdf
    • http://bunnybeast.com/uploads/1/3/0/5/130589131/xelolufaluvatuvam.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_off000063c6.bin
16d0af025519105a3ed974e34d9df63047c129500fd1e76cd3c7b08b7b1bed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 8140 bytes

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