Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c306ff5957351e9…

MALICIOUS

PDF

36.0 KB Created: 2020-06-08 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0117a6d9c4099923370de64f5b30c6cb SHA-1: 99c92d866fc2c5295b01407aab24443e70184781 SHA-256: 6c306ff5957351e99c31b7ed070d12385693c1df9bc52b42ec70cf5c1f41d868
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful 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://antraflooring.com/uploads/1/3/1/3/131383998/131383998.html#monster+high+friday+night+frights+google+drive
    • http://coruscant.ch/uploads/1/3/0/6/130621516/baroga.pdf
    • http://yourstrulyerikab.com/uploads/1/3/1/4/131409761/0a5e8ad786d4.pdf
    • http://vacationmemories.voyagerwebsites.com/uploads/1/3/1/6/131606025/xegosixivosep-doxuva.pdf
    • http://hudsonandford.com/uploads/1/3/1/8/131871499/forefagi_senoboxusuran_mowidujifi.pdf
    • http://golftechnow.com/uploads/1/3/0/9/130969678/7017151.pdf
    • http://msonormaltable.net/uploads/1/3/1/6/131607374/nidadewasek.pdf
    • http://birchmanland.com/uploads/1/3/1/1/131164291/redipi.pdf
    • http://rf.undesirable.us/uploads/1/3/0/4/130476216/7623831.pdf
    • http://hdhairpro.com/uploads/1/3/1/6/131637951/6448057.pdf
    • http://myetinfo.com/uploads/1/3/0/7/130739026/1625169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vawofomije194917598.files.wordpress.com/2020/06/votuzopuwodu.pdf
    • https://xafosuxifi.files.wordpress.com/2020/06/roparegexokofawiwedagu.pdf
    • https://toxuluva830071386.files.wordpress.com/2020/06/bijilibatamogon.pdf
    • https://tipubek.files.wordpress.com/2020/06/44793116455.pdf
    • https://jipebowojor.files.wordpress.com/2020/06/gosisuborakagevijob.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000606c.bin
a98be9bd14e025f63417fcb68491590c4194844722a33234eb435c0e20a34019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 10884 bytes

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