Malicious PDF — malware analysis report

Static analysis result for SHA-256 1572f3a00397af0c…

MALICIOUS

PDF

75.6 KB Created: 2020-04-10 22:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ffdad32686ab9a721c39ed1d82a4376 SHA-1: f88647649af8654a5a69dbbeb03853ecffbc5960 SHA-256: 1572f3a00397af0c3ffa3c66cf2fc5ce41024b5491370645de5b7b840cbc5f0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text but includes a URL that is also present in the list of extracted URLs. The primary function appears to be directing users to a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://riversidecountyhistory.org/uploads/1/3/0/8/130814338/130814338.html#hercules+aterrizaje+de+avi%C3%B3n+en+lada
    • http://johngeneralconstruction.com/uploads/1/3/0/6/130639681/fizepu.pdf
    • http://soapmeplease.com/uploads/1/3/0/5/130551621/mibujuzigevetes-xoxipowej.pdf
    • http://retreatatthedale.com/uploads/1/3/0/7/130740189/gedezenibeduno_tebulatu.pdf
    • http://royaltreatment-board-groom.com/uploads/1/3/0/6/130639160/be6f1ce3bb.pdf
    • http://towingcliftonnj.com/uploads/1/3/0/7/130740116/4960427.pdf
    • http://emgofwashington.com/uploads/1/3/0/2/130272361/3494720.pdf
    • http://unclebiffscookiesarizona.com/uploads/1/3/0/7/130775336/dudazukawugolikomek.pdf
    • http://cypress-it.com/uploads/1/3/1/3/131381540/7442069.pdf
    • http://thewhitehouseproductions.com/uploads/1/3/0/2/130288399/ruxasalezunedu.pdf
    • http://22tozerodogs.org/uploads/1/3/0/3/130379164/xoxogegukoja.pdf
    • http://bjsmooreliquor.com/uploads/1/3/1/3/131380058/fiwedoxux_feloxani_tixexupokukeb_rizuxopod.pdf
    • http://lacasadelourdes.biz/uploads/1/3/0/5/130589220/8800053.pdf
    • http://dfransart.com/uploads/1/3/0/5/130545581/lidexu.pdf
    • http://detourmovement.org/uploads/1/3/1/0/131070859/3381568.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_off0000dc21.bin
b35521c6bf39dc4c35995ae742d3658d5e21dfe6ed0274e216191ad78f6abb5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10184 bytes
font_01_sfnt_off00010087.bin
7724e0f1fc23f9f897079c50ca4ed6e1148a776f4ca3272d82b94c52c19aabb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 2820 bytes
font_02_sfnt_off00010a67.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16036 bytes