Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29bbfb98f8377f4…

MALICIOUS

PDF

54.8 KB Created: 2020-04-11 05:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3458c18f5be63e68023f0d3ed9ac266c SHA-1: 972222cac979abc44efd3e78bff9cf404c9af7bc SHA-256: a29bbfb98f8377f4f19b23aa341224b65e20aa80c7ad7eff6f9663a2f7032c04
70 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be part of an SEO link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body text, though partially obfuscated, includes 'Textbook in chinese' and a URL, suggesting a lure to a potentially malicious website. The presence of a 'download button' heuristic further supports a social engineering attack. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://blockchainambassador.ca/uploads/1/3/0/2/130271217/130271217.html#textbook+in+chinese
    • http://gbicenter.com/uploads/1/3/0/5/130540085/167f4c503b8db.pdf
    • http://traprockpottery.com/uploads/1/3/1/6/131606193/a410bbb4c.pdf
    • http://edensdale.org/uploads/1/3/0/3/130323968/a33da87a0e8a14.pdf
    • http://thegetclearcoach.com/uploads/1/3/1/3/131398489/b7805b09.pdf
    • http://nounoula.com/uploads/1/3/0/3/130323510/gozetigol_gobulos.pdf
    • http://securemoneygroup.com/uploads/1/3/0/7/130776130/9567593.pdf
    • http://manoliskaratarakis.website/uploads/1/3/1/3/131383998/dupivilewevabitimab.pdf
    • http://gnfi.com/uploads/1/3/0/4/130478067/1757bb.pdf
    • http://trubodyphysicaltherapy.com/uploads/1/3/0/7/130775244/3302343.pdf
    • http://thestafffinder.com/uploads/1/3/1/3/131384663/sanudezajoji.pdf
    • http://hostmaster.321letshavefun.co.uk/uploads/1/3/0/6/130621555/nuguxaminuvibi.pdf
    • http://vitalogynaturals.com/uploads/1/3/0/7/130739478/dopilikaviwiboxakura.pdf
    • http://tokped.services/uploads/1/3/0/7/130738936/gezosomukepel.pdf
    • http://edcmagnets.com/uploads/1/3/0/7/130739559/751559932e.pdf
    • http://coloradospringscowebsites.com/uploads/1/3/0/5/130588435/getulomin_vutifaribewubuk_jibazaxizujowov.pdf
    • http://manoliskaratarakis.website/uploads/1/3/1/3/131383998/dupivileweva
    • 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_off00008c48.bin
08c14916a9025f008eea0d29f981607012ca524e5491f1c1640c27b28296ac48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 8788 bytes
font_01_sfnt_off0000ad2b.bin
c9670650cf67cef4e79b85f6c9cb2c5354788452a7cf278768f61b1baeb903d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 9888 bytes

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