Malicious PDF — malware analysis report

Static analysis result for SHA-256 348a9b377438dad6…

MALICIOUS

PDF

45.1 KB Created: 2020-03-29 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a08a4b95cc467847ac8725ebc3c28050 SHA-1: 7193e62e664493eb1b0440cac14cb0d78ab60c3a SHA-256: 348a9b377438dad6f0c384284d8e9473c90e0b81c29948f97cff79befb5c28a6
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious or low-quality content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://gomriz.com/uploads/1/3/0/7/130738974/130738974.html#electric+smoker+cooking+brisket
    • http://wouldwear.com/uploads/1/3/0/5/130588622/rubakavexazux_domula.pdf
    • http://teresejuntz.com/uploads/1/3/0/4/130476539/xutaselenovewumu.pdf
    • http://exquisitefiestas.com/uploads/1/3/0/6/130639382/9830482dfa9.pdf
    • http://michelleblanchette.org/uploads/1/3/0/5/130589064/woguxed-rozusekuweliz.pdf
    • http://vixenpromakeup.com/uploads/1/3/0/2/130271081/suzedafukogif.pdf
    • http://mail.harlowjudoclub.com/uploads/1/3/0/7/130738786/c704e9c8c20e.pdf
    • http://www.dasbikehaus.com/uploads/1/3/0/6/130604844/mipajuzemokumaxajek.pdf
    • http://nandrews.net/uploads/1/3/0/5/130588954/30b8e24.pdf
    • http://shopbowsbyjo.com/uploads/1/3/0/5/130548070/sulovufejonoxe.pdf
    • http://mta-sts.mx.douglascountyyouthorchestra.org/uploads/1/3/0/6/130639292/695208.pdf
    • http://novasnow.store/uploads/1/3/0/9/130968976/gasur.pdf
    • http://damascusreport.net/uploads/1/3/0/5/130539885/0c1a0c403.pdf
    • http://studysmartedu.com/uploads/1/3/0/6/130621592/8202073.pdf
    • http://www.financeotherwise.org.uk/uploads/1/3/0/6/130604313/beboje_laboduvovi_mazid.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_off00007426.bin
95a63a8c057e9ae98e974e75d914ec037240ffaf226f9338fec676a37d8b762c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 7760 bytes
font_01_sfnt_off0000925f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925F 16036 bytes

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