Malicious PDF — malware analysis report

Static analysis result for SHA-256 72676d360e9b6886…

MALICIOUS

PDF

43.6 KB Created: 2020-03-24 04:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 893792cfe09b141b1549d46a20d964e6 SHA-1: 8ccedd26074ebc451bfb82fbe6a85f81105d97a7 SHA-256: 72676d360e9b6886dc4b840b7be21fffdd007e6359102555071750ccdaf7e3b6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect the user to potentially harmful sites.

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://tuitionhotsauce.com/uploads/1/3/0/8/130813997/130813997.html#tablas+de+multiplicar+3+para+imprimir
    • http://www.menosaurs.com/uploads/1/3/0/7/130776158/xonitodafalifata.pdf
    • http://oceanscapenet.com/uploads/1/3/0/5/130588786/baburudemakofo_pezexin.pdf
    • http://assemblyrowoffice.com/uploads/1/3/0/6/130621717/0975e29a03a.pdf
    • http://lariateers.com/uploads/1/3/0/6/130620981/6426142.pdf
    • http://mta-sts.greybytori.com/uploads/1/3/0/9/130968956/lizekofetatatiro.pdf
    • http://www.shoponesunday.com/uploads/1/3/0/2/130291975/03dbafadc60.pdf
    • http://stargate.sicog.org/uploads/1/3/0/2/130270971/5406897.pdf
    • http://wangshangqipaiyouxizhuanqian.br3h.com/uploads/1/3/0/7/130775192/vodimumuwub.pdf
    • http://savingthesteelhead.org/uploads/1/3/0/5/130589180/444d13.pdf
    • http://uneedem.com/uploads/1/3/0/5/130543279/3818172.pdf
    • http://mollyrosemakes.com/uploads/1/3/0/2/130271046/e59d4fe7e7d.pdf
    • http://littlefreelib.com/uploads/1/3/0/6/130640232/5f8d78514138.pdf
    • http://www.aledobands.com/uploads/1/3/0/5/130550801/6cf1fda61e9952.pdf
    • http://ladieslovemaryjane.com/uploads/1/3/0/7/130775740/0814d.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_off000069ba.bin
3c0870424d7e31e042a0880222bc6c56b1e99d9746e42f8cc166f7bfb43bf494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BA 8876 bytes
font_01_sfnt_off00008a13.bin
de2ccdaff894287c651098c150fd5616560153c4f3534cf13f84c42cbd896a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A13 16060 bytes

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