Malicious PDF — malware analysis report

Static analysis result for SHA-256 7937c748ad6ace7e…

MALICIOUS

PDF

80.9 KB Created: 2020-03-26 02:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 811bbd3fbe2a3eff0c51cbd4ca0c77b3 SHA-1: f7cea0959db256a26a42a86c69f497e57625f20e SHA-256: 7937c748ad6ace7e8db9e9acb337f2a454471baa32e5f4670ca772831f21b56f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the sheer volume of external links suggest a malicious intent to redirect users 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://lotsofsmooches.com/uploads/1/3/1/0/131070331/131070331.html#que+es+el+castellano+lenguaje
    • http://boltprogram.com/uploads/1/3/0/6/130620455/bajuditiw.pdf
    • http://midcountydentalcare.com/uploads/1/3/0/7/130738732/zaropox.pdf
    • http://avenuevance.com/uploads/1/3/0/5/130589122/vomixofafagonibuwo.pdf
    • http://rn2ed.com/uploads/1/3/0/7/130776081/lavudegoxup_gugemudeg.pdf
    • http://summitdiner.org/uploads/1/3/0/7/130738619/219ce16f4b770.pdf
    • http://thetravelfactorywithnorma.com/uploads/1/3/0/6/130604195/migufiwafefokelik.pdf
    • http://www.atischphoto.atischphotography.com/uploads/1/3/0/7/130775088/b4b5ace603833f8.pdf
    • http://www.jessthigpen.com/uploads/1/3/0/3/130323216/0059a.pdf
    • http://diligentdiamond.com/uploads/1/3/0/4/130476407/877086bc6.pdf
    • http://pollyshulman.net/uploads/1/3/0/4/130483836/e4599fd0fbfa5.pdf
    • http://cescoequipment.org/uploads/1/3/0/7/130738903/karixe_panajun.pdf
    • http://www.armenianchurchofkuwait.com/uploads/1/3/0/2/130288643/mifej.pdf
    • http://metallicblackrecords.com/uploads/1/3/0/6/130604653/f42816.pdf
    • http://bunsngunsfitness.com/uploads/1/3/0/5/130543240/mafitanepofo.pdf
    • http://changingperspectivesblog.com/uploads/1/3/0/6/130621412/neluletuduxi.pdf
    • http://artanimalaffect.com/uploads/1/3/0/4/130483213/944a15a6c41.pdf
    • http://rawk-cbd.net/uploads/1/3/0/7/130739549/puduk-gamutilajot-lomomukomadem.pdf
    • http://empatheatre.net/uploads/1/3/0/4/130478609/sugefonulozarusedof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
2763b4adac55e5ec0854b64af3a07a37c6c523e8a6c42af69cf4bfcae75085b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 10496 bytes
font_01_sfnt_off00011563.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 2652 bytes
font_02_sfnt_off00011eca.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16036 bytes

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