Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b96f47abb3dc12f…

MALICIOUS

PDF

48.5 KB Created: 2020-06-26 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23ab792b1b9884a4fd68c46071fc88ae SHA-1: 9ce0a37a082e5aa218d6fa7e313eede677334666 SHA-256: 6b96f47abb3dc12f52e38abb5d03764bcdcf75fc1c8490be7463dacb8f0d3f8a
104 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content. 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 structure and heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://files.embeinspiration.com/uploads/1/3/0/5/130544232/130544232.html#the+message+bible+pdf+free
    • http://oliveraconst.com/uploads/1/3/0/5/130550844/kafixojavamoxitetapo.pdf
    • http://thevacationstation49.com/uploads/1/3/0/7/130774990/4237084.pdf
    • http://edendayspaboutique.com/uploads/1/3/0/5/130551777/20c31dba4c12.pdf
    • http://philsheridanstudio.com/uploads/1/3/1/3/131381612/jorifidokoxasoren.pdf
    • http://craftyourvoice.com/uploads/1/3/1/3/131384484/3300333.pdf
    • http://klfthefirm.com/uploads/1/3/0/7/130776081/pabirabo-posir-gujelututise-zinosuboruxule.pdf
    • http://greenspringtreeservice.com/uploads/1/3/1/8/131871456/86aea8b64c4bec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://varaziwatu.files.wordpress.com/2020/06/jirenamive.pdf
    • https://gijatok.files.wordpress.com/2020/06/10552168157.pdf
    • https://fumepuwabipa.files.wordpress.com/2020/06/86925992688.pdf
    • https://rawerif.files.wordpress.com/2020/06/zebapodupadalixagapusumu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e6d.bin
7a6c56940a8681d6c747dc883cc7de1a31c40e66cecf7d26367addd50a6b7a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 5036 bytes
font_01_sfnt_off00008f7c.bin
bbef3defe003838ee718f324301c22cb80a768ac78d3d90649ad830001e98758
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7C 10860 bytes