Malicious PDF — malware analysis report

Static analysis result for SHA-256 3422bfe4e9a57089…

MALICIOUS

PDF

33.4 KB Created: 2020-04-13 17:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b2a4ab3af12a2715315d394b5c83c536 SHA-1: 8b9d5523db066b25e1fe03087c38c7eb9a6c4c6f SHA-256: 3422bfe4e9a5708957312b83c5bdc7ad14e0c3b60e63ff724ac5e594bc2a5a5c
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, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. This suggests the document's primary purpose is to redirect users to a network of potentially malicious websites, possibly for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious intent.

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://nupelicanparty.org/uploads/1/3/0/7/130775755/130775755.html#amaaso+vinka+audio
    • http://coxcontractingservices.com/uploads/1/3/1/3/131397955/jidis_tisodi_gupojuwapitow_jopoka.pdf
    • http://carterwestbound.com/uploads/1/3/0/5/130590545/381c5e682ea0.pdf
    • http://omgitzlo.com/uploads/1/3/1/4/131453527/xofukogubawepilev.pdf
    • http://alternativeholisticwellness.com/uploads/1/3/0/4/130476784/zogejam.pdf
    • http://northriverfinancing.com/uploads/1/3/0/4/130493037/tawagusoko_tanufiwur_bonekonafazegav_vakefugukado.pdf
    • http://qcarguidance.com/uploads/1/3/0/4/130483447/navomowotaka.pdf
    • http://cotaaldia.com/uploads/1/3/0/9/130969431/c038341e7c4f.pdf
    • http://small-townphotography.com/uploads/1/3/0/2/130289335/ketotes_zabepuvalu_zetoganepe_nizarabe.pdf
    • http://screfrigeration.com/uploads/1/3/0/8/130814009/wegusokevos.pdf
    • http://aministryofmusic.com/uploads/1/3/1/4/131454932/4362219.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3a.bin
eadb79eabf6bc6733e4588df48eb4231130601d3b2c9276521e6d0f9e5eaf111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3A 7288 bytes

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