Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c2dca1231921c6…

MALICIOUS

PDF

51.4 KB Created: 2020-03-20 15:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a53193bcfecf73ff2bcf16bfe229122f SHA-1: 3987182f71f8ef623bc3ac853e5b64ca3683a8f8 SHA-256: a3c2dca1231921c6744d8b9c194a2e1e52ec66c68848529408fda6a31c2b042b
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users through a link farm to numerous other PDF files hosted on various domains.

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://corastlc.com/uploads/1/3/0/5/130590741/130590741.html#resumen+de+caracter%C3%ADsticas+y+funciones+de+los+lisosomas
    • http://www.mattrosaaeneducationleadership.com/uploads/1/3/0/3/130313468/2b9d8f869.pdf
    • http://www.die-stiefs.de/uploads/1/3/0/2/130272619/rekesojoxisu.pdf
    • http://naafay.net/uploads/1/3/0/4/130476605/d41f396d4dcc9.pdf
    • http://wwssf.org/uploads/1/3/0/5/130590665/02ec424848627.pdf
    • http://www.misswilkins.com.au/uploads/1/3/0/5/130543020/dosalefove.pdf
    • http://www.ladylatraverse.com/uploads/1/3/0/2/130287504/naxuziparukimoja.pdf
    • http://hostmaster.djholyscratch.com/uploads/1/3/0/5/130550921/jevenadumobanibiriwa.pdf
    • http://ytntrapway.com/uploads/1/3/0/7/130739826/bixubozen.pdf
    • http://vintageautolit.com/uploads/1/3/0/8/130814769/1668732.pdf
    • http://fremontrose.com/uploads/1/3/0/6/130639203/2030434.pdf
    • http://elevitae.com/uploads/1/3/0/6/130605174/mepadupuxuser_meresobopob_keresewiv_buxis.pdf
    • http://www.ilovechinesemedicine.com/uploads/1/3/0/6/130604083/88b8b0d1df81d.pdf
    • http://www.ivyandroses.com/uploads/1/3/0/6/130604939/jamufuxifepiwirilup.pdf
    • http://allstarimagination.org/uploads/1/3/0/4/130493389/puvomakujaxerexunab.pdf
    • http://fitrition.com.au/uploads/1/3/0/7/130776688/7a381219215645b.pdf
    • http://morgangao.com/uploads/1/3/0/4/130478314/vonomeva.pdf
    • http://christianbebrave.org/uploads/1/3/0/5/130545021/bubuguwenig.pdf
    • http://postmaster.inkasmode.nl/uploads/1/3/0/5/130542860/jeredigonuw.pdf
    • http://cincinnatibassteachers.org/uploads/1/3/0/7/130775292/7042724.pdf
    • http://exsolution.net/uploads/1/3/0/7/130738543/9272288e6c6018f.pdf
    • http://casaraumdesign.de/uploads/1/3/0/7/130740510/8242446.pdf
    • http://atwliving.online/uploads/1/3/0/2/130289352/231220.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dcf.bin
0d70b741babad8372a9c58fe5b573128220c7faefccc41a02eb2337bf55f85eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCF 8632 bytes
font_01_sfnt_off00009d5c.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5C 2864 bytes
font_02_sfnt_off0000a773.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA773 16036 bytes

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