Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef6201eed57154b…

MALICIOUS

PDF

60.3 KB Created: 2020-04-07 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ee7ad4e8d08113bca1de3ad36c1268a SHA-1: 22473532acd6c67a4c9c7d92f376b1971239cc50 SHA-256: 6ef6201eed57154b60839ed8721634f923463e9b880437686b3935b3a8552eeb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://slovakprotectiondogs.com/uploads/1/3/0/4/130488513/130488513.html#que+es+una+unidad+central+de+proceso
    • http://fugeforasia.com/uploads/1/3/0/4/130490561/sexex-ranumuwax-tovesarol.pdf
    • http://hiver19by-marclannoo.com/uploads/1/3/0/5/130551943/tasenedunotefixin.pdf
    • http://olivianovello.com/uploads/1/3/1/4/131438121/7661285.pdf
    • http://hollandhomesnw.com/uploads/1/3/0/5/130590561/xujemalewubixu-foriboximapusa-xogegutasaboze-petuxuxufofu.pdf
    • http://alovethatlasts.net/uploads/1/3/0/5/130551729/7129375.pdf
    • http://godlikecombo.com/uploads/1/3/1/3/131398597/zivenorefonu-xasokasemop-mozenan.pdf
    • http://vikingelectronicsecurity.com/uploads/1/3/0/8/130874257/86f36aedbc.pdf
    • http://houstontxhomeinspection.com/uploads/1/3/1/3/131379729/karadepuwodif-fadofazukobawi.pdf
    • http://in2itconsultants.com/uploads/1/3/0/6/130620494/fdb2bf7f4133.pdf
    • http://nccsecec.org/uploads/1/3/1/4/131454859/0e168b81424.pdf
    • http://drhiltonkaplan.com/uploads/1/3/0/4/130490665/fulizede.pdf
    • http://shaysm22.com/uploads/1/3/0/4/130476501/9507948.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off00009859.bin
96fdc306789078f720b4de19c73c2c38a0da4ee74d05e55c14d23f795788afc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9859 6816 bytes
font_01_sfnt_off0000a965.bin
d6b053c76a353d6a8231285c05722e1412ebedcf9b90855d8dea4c5919bbdfdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xA965 9724 bytes
font_02_sfnt_off0000cbc1.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16312 bytes