Malicious PDF — malware analysis report

Static analysis result for SHA-256 b874843b117c883a…

MALICIOUS

PDF

48.3 KB Created: 2020-04-27 20:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c2c923b3869514c09e2fdc9182ca3bef SHA-1: 0bdc24baf4a1c238a0a02010a7a9802f810496bc SHA-256: b874843b117c883ab93c378dfe9cd27839092ff8bf81bbf9ddfda63aa530f1f2
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 with numeric slugs, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to academic-sounding titles and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of directing users to potentially harmful external sites.

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://myentouragemusic.com/uploads/1/3/1/3/131380636/131380636.html#uniform+asymptotic+expansion+of+integrals
    • http://sturgeonrock.com/uploads/1/3/0/6/130604300/xumimat.pdf
    • http://kingdomwealthcreatorsunite.com/uploads/1/3/0/7/130775471/wikazeme.pdf
    • http://molonlabearmory.com/uploads/1/3/0/2/130291474/3324609.pdf
    • http://affordablypricedphotosandvideo.com/uploads/1/3/0/6/130604113/111636.pdf
    • http://heyboopro.com/uploads/1/3/0/5/130539763/miferolajitenowef.pdf
    • http://sscsusa.org/uploads/1/3/0/5/130543059/403606.pdf
    • http://enbrighteneducation.biz/uploads/1/3/0/7/130740553/fuvasamez.pdf
    • http://habibimodayelegancia.com/uploads/1/3/1/8/131872286/c1813.pdf
    • http://maisaengager.com/uploads/1/3/0/7/130776555/607168.pdf
    • http://kreutingerpuppets.com/uploads/1/3/1/3/131378952/sinip.pdf
    • http://time2focus.net/uploads/1/3/0/7/130776125/b53268.pdf
    • http://hanaresorts.com/uploads/1/3/0/5/130590338/vapeniwoni_finavuxevenuxu_bilugaluweke_jukuxital.pdf
    • http://redlinemobilellc.com/uploads/1/3/0/3/130313294/9475922.pdf
    • http://krisalia.net/uploads/1/3/0/6/130640172/pexibufixetik.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_off00006e62.bin
bf9cb7e7ec95726aa8ca99927002332281af056d42289860465d1f97a60eb34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 9564 bytes
font_01_sfnt_off00009204.bin
722211dae55171361721b6bc65c025a27f6987d1232cadb74667564e97391665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9204 3412 bytes
font_02_sfnt_off00009dfe.bin
2dfae6fc2d4fd2355130e03c74659db8d76860e400a96a4b47156ef5cb7f2f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFE 16268 bytes

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