Malicious PDF — malware analysis report

Static analysis result for SHA-256 b609229e07d368a8…

MALICIOUS

PDF

44.0 KB Created: 2020-04-02 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b77b3a9c8735730bf71d244776bf86d8 SHA-1: 9063a94aaa96519b00495549601e0ef0dc51b843 SHA-256: b609229e07d368a8cd5b9302e4ed7b9923e90ee58b7b09f3132a1e3461f50420
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO manipulation scheme. 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://rehphotography.org/uploads/1/3/0/4/130435635/130435635.html#ddo+prove+your+worth+walkthrough
    • http://essdisi.com/uploads/1/3/0/6/130604733/desitugo.pdf
    • http://oglethorpecountyprek.org/uploads/1/3/0/6/130621312/zamupe-tifizesabe-lusexaluku.pdf
    • http://450studio.com/uploads/1/3/0/3/130313103/8806529.pdf
    • http://chartreusebancorp.com/uploads/1/3/1/3/131379447/ropovimefiki.pdf
    • http://unitedhomeinspectionservicesinc.com/uploads/1/3/0/4/130476471/pizizogupum.pdf
    • http://pradoruelas.com/uploads/1/3/0/8/130874670/d86aae.pdf
    • http://headyneddies.com/uploads/1/3/0/3/130313086/xatesitow.pdf
    • http://tamas-banki.com/uploads/1/3/0/7/130775358/4121063.pdf
    • http://yzy1.net/uploads/1/3/1/1/131164455/db5b02e62.pdf
    • http://chapteraviation.com/uploads/1/3/0/8/130874296/57967302509a.pdf
    • http://quyhuy.com/uploads/1/3/0/5/130545816/7125414.pdf
    • http://sunfanglu.com/uploads/1/3/0/9/130969708/20579bfef83.pdf
    • http://trivettefamilyfarm.com/uploads/1/3/0/2/130270776/gibivapexomadis_munorapetivuwar_dexepirosasokek_nirilebibuba.pdf
    • http://nlica.org/uploads/1/3/0/5/130588982/677837.pdf
    • http://urbanvertical.ca/uploads/1/3/0/7/130776103/9754417.pdf
    • http://tmsh-wph.com/uploads/1/3/0/7/130739690/liludetoborivap.pdf
    • http://vitaminart.net/uploads/1/3/0/5/130544352/tuwapajuxug.pdf
    • http://pocketstopit.com/uploads/1/3/0/2/130271234/9402073.pdf
    • http://kittymac.co.uk/uploads/1/3/0/4/130478935/5027795.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_off0000771a.bin
13f8e75cdc9047f48ae6ab88d4b6f8c55b5263e389d42f285d1a413a96eca947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 8208 bytes
font_01_sfnt_off000096a7.bin
93d18b0406e48a3281d281d937c8204c59d1f1c7e5b52ef70c8eadb0d5a5e000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A7 3328 bytes

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