Malicious PDF — malware analysis report

Static analysis result for SHA-256 8102da611473af23…

MALICIOUS

PDF

46.2 KB Created: 2020-04-22 12:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b091701976682269f602fc64aaa19d65 SHA-1: 119d2b72b257904db68cc1b032556d9b00379e15 SHA-256: 8102da611473af23c4557270f851bec65efbd497d4a332b529f79d51b35a95d1
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to lead the user to a compromised or malicious resource, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kmfcivil.com/uploads/1/3/1/4/131408344/131408344.html#copenhagen+food+market+norreport
    • http://medicahomeopata.com/uploads/1/3/0/3/130379243/8453777.pdf
    • http://thebuddhasutra.com/uploads/1/3/1/3/131380292/76c7e4ed.pdf
    • http://simplynewenglandbridal.com/uploads/1/3/0/3/130313436/doxodib.pdf
    • http://bpacontractorsme.com/uploads/1/3/1/3/131379439/0705b87fae8f7.pdf
    • http://joannekakatymonzo.net/uploads/1/3/0/2/130272270/5572914.pdf
    • http://harnessyourbreath.com/uploads/1/3/0/5/130541904/eb419e1.pdf
    • http://chirpking.net/uploads/1/3/1/4/131483423/varufinirozafexuzun.pdf
    • http://solitegroup.com/uploads/1/3/1/4/131453576/sezip-noruli-taxitu-nofenakuwed.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://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_off00006c24.bin
83614c5a5967b39399f5ed9dfccfd2b709fdd7838ba335f40796ae7afbf5b7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C24 8372 bytes
font_01_sfnt_off00008c3b.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3B 1708 bytes
font_02_sfnt_off000094a1.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A1 16312 bytes

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