Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f8e7de41119c2f…

MALICIOUS

PDF

48.5 KB Created: 2020-03-13 05:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dc5e1bfa3e2c0678fd3337682a01c13 SHA-1: f9ada8459aee996e52e026f2db0fe06baf967cfd SHA-256: 87f8e7de41119c2f78e68283cb818fe3bcd006368b6e855d8dc0d5f98ddf0d9e
94 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, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the mass distribution of external links, likely for SEO spam or to lead users to malicious content.

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://www.sunandstars.net/uploads/1/3/0/4/130435654/130435654.html#ittf+table+tennis+world+cup+2018+held+in
    • http://www.turnkeysolutions.services/uploads/1/3/0/5/130589064/fb0966.pdf
    • http://arsenalschoolksa.com/uploads/1/3/0/7/130776055/tewefeg-giruna-kitolatimajewi-lipewaxemipek.pdf
    • http://www.rdraruba.com/uploads/1/3/0/7/130775443/d1df9.pdf
    • http://mx.artrageousfolk.com/uploads/1/3/0/6/130639802/vikilulubigekaxiwop.pdf
    • http://verasstudio.com/uploads/1/3/0/8/130874539/peleronumaroruxen.pdf
    • http://creginvestmentsllc.com/uploads/1/3/0/4/130483302/4524721.pdf
    • http://jakebrenneise.org/uploads/1/3/0/4/130483761/674071.pdf
    • http://ktrpo.com/uploads/1/3/0/6/130640091/3013357.pdf
    • http://bohemianbirth.ca/uploads/1/3/0/2/130288557/gupubanomim-pobig-binamusebugi-pudure.pdf
    • http://noojoom-swissra.com/uploads/1/3/0/6/130622116/c8f075db6.pdf
    • http://eurobonus.lt/uploads/1/3/0/8/130874358/4367257.pdf
    • http://www.yourkstspot.com/uploads/1/3/0/5/130590770/e18d5.pdf
    • http://genreccatalogs.com/uploads/1/3/0/8/130814553/3080d8f934bf.pdf
    • http://shc-ilc.hct.ac.ae/uploads/1/3/0/5/130541077/bominakekolunoweze.pdf
    • http://realestatesolutions360.com/uploads/1/3/0/8/130813965/f4baec.pdf
    • http://dakotaadornments.com/uploads/1/3/0/4/130435702/d7c7b4046c.pdf
    • http://riverplus-mes.com/uploads/1/3/0/5/130588438/xirivilo.pdf
    • http://www.4dfreedom.com/uploads/1/3/0/5/130543488/rataner_kovima.pdf
    • http://cuffedbyjewels.com/uploads/1/3/0/6/130621191/farowodebagojaz.pdf
    • http://mylebleutriad.com/uploads/1/3/0/6/130621110/5038287.pdf
    • http://www.stoneslifecoaching.com/uploads/1/3/0/5/130551621/nexesozujeg.pdf
    • http://cuffedbyjewels.com/uploads/1
    • 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_off00007355.bin
cf4aab1d3ddd882766cef536d461901bebb6cf3be5b9b3f977a2b06273cebb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7355 8616 bytes
font_01_sfnt_off0000931a.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931A 2732 bytes
font_02_sfnt_off00009cca.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCA 16064 bytes

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