Malicious PDF — malware analysis report

Static analysis result for SHA-256 11741fce8f18095c…

MALICIOUS

PDF

42.2 KB Created: 2020-03-23 05:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 44a13bdbb4f604365b5099e4e21a3996 SHA-1: 4c00b60debb1a5f9d46affe235958916e290ac33 SHA-256: 11741fce8f18095cc1348f2aed04b9ba9d263f9c32e553cc14796524430cc067
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://thesocieaty.com/uploads/1/3/0/5/130539300/130539300.html#program+to+convert+infix+to+postfix+in+data+structure+c+++using+stack
    • http://reli-pedeli.com/uploads/1/3/0/7/130776089/wezedanip.pdf
    • http://www.sussexslam.com/uploads/1/3/0/4/130476047/xujisinan.pdf
    • http://www.creativecasemanagementinc.net/uploads/1/3/0/8/130873937/5999757.pdf
    • http://tanjoy.net/uploads/1/3/0/6/130621013/6475511.pdf
    • http://newyorkcarpettile.com/uploads/1/3/0/6/130639945/1add245e890ed0.pdf
    • http://northshoresmallbusiness.com/uploads/1/3/0/5/130545249/vaxam_mugofosemotixo_setivinar.pdf
    • http://mrbrownmoderngent.com/uploads/1/3/0/2/130289496/08212e.pdf
    • http://drlawrencebaker.com/uploads/1/3/0/2/130291328/fb6998b907b7.pdf
    • http://agl-llc.com/uploads/1/3/0/4/130483949/kitowigukaje-zunapupoxe-fumaki-xinejisoruleb.pdf
    • http://rokdance.com/uploads/1/3/0/8/130873937/voxap.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632a.bin
a9e284ac036d5f5c0375b6dc8a3313ea4c16d868861ec59e2ce6e1b5f39b5de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 8948 bytes
font_01_sfnt_off0000857c.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 16204 bytes

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