Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b04819274d7843…

MALICIOUS

PDF

52.8 KB Created: 2020-04-07 03:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6c10a07ec3f81a8b31d7a837127b7b45 SHA-1: b057ddbac9d3c73dc3bfac5dde6a1e8983d07333 SHA-256: 01b04819274d784316c9dc3d259659e15464800dcf9a23bfd1a30e5068d52b7a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a reference to a URL that is also present in the list of embedded links, suggesting a coordinated effort to direct users to external sites. No scripts were extracted, but the sheer volume of links points towards a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drhamby.com/uploads/1/3/0/6/130603683/130603683.html#5+ejemplos+de+oxidacion+en+la+vida+diaria
    • http://makingmusiconenoteatatime.net/uploads/1/3/0/9/130969823/sokugojujir-sonulejuboziz-fikerimamekab-gagofani.pdf
    • http://anniesallans.com/uploads/1/3/0/6/130604366/tutawavav_gozexusitapa_jowexunoka_tinaserekojem.pdf
    • http://limosinkaty.com/uploads/1/3/0/2/130292104/pidanetirupekar-dilalolaler.pdf
    • http://mrboldt.com/uploads/1/3/0/7/130776319/1588483.pdf
    • http://cwcraftcreations.com/uploads/1/3/1/4/131454482/vokinunekozum-texapodu.pdf
    • http://detourister.com/uploads/1/3/1/4/131438111/xujokirumadosiwo.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_off0000835c.bin
831438d50345386ea40b970558913b4a69370911cb9a4042f353800012e24a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x835C 9564 bytes
font_01_sfnt_off0000a5ad.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AD 2652 bytes
font_02_sfnt_off0000af14.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16036 bytes

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