Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a332a8b82d493d…

MALICIOUS

PDF

38.2 KB Created: 2020-04-17 04:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ae0bb0789ceecd6c8c20aa4e1c4c1978 SHA-1: 970cb8310e7a124e2eafdc69b0effe60350e7cb1 SHA-256: 65a332a8b82d493df59c8bb3b191b634fa8f7fac3311ba885fa90dc356f51eab
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The document body, though partially corrupted, includes a reference to a 'British geological society volcano template', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity.

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://b-your-best.net/uploads/1/3/1/4/131438685/131438685.html#british+geological+society+volcano+template
    • http://ezondowntheroadbikes.com/uploads/1/3/0/6/130604032/mugemovawuwo-merolefodowe.pdf
    • http://holyhanna.net/uploads/1/3/0/5/130550711/bb3475f4c0.pdf
    • http://nirvanatails.org/uploads/1/3/0/6/130620159/xugewel.pdf
    • http://muapic.com/uploads/1/3/0/4/130435941/linelenuwebaf.pdf
    • http://pvdbc.com/uploads/1/3/0/5/130538945/3443933.pdf
    • http://borirepa.com/uploads/1/3/0/2/130270897/guwusigafefesad.pdf
    • http://karalegal.com/uploads/1/3/0/5/130538839/5ce41925c282b.pdf
    • http://valkyriesurfer.com/uploads/1/3/1/6/131636991/roragezu.pdf
    • http://lovemattersllc.com/uploads/1/3/0/8/130874309/sunidotepefu.pdf
    • http://palatka.space/uploads/1/3/1/4/131414297/xizekul_zevugidemuretij_tilatipamigag.pdf
    • http://socialmediaflux.com/uploads/1/3/1/1/131163943/wifumigosipogi_xorevizomitesi_nisagaz.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_off00006993.bin
0d5c8c9fef98dc50e6e5c5eb14b8bbf36ee70151b094bf5b339db41640a40e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6993 8820 bytes

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