Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c12051339e26400…

MALICIOUS

PDF

43.4 KB Created: 2020-04-18 00:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e550b458f46e343b04a736ab3f7c916 SHA-1: 201c9ea745dcdeb4205d7078da23ef864fd6044b SHA-256: 6c12051339e2640023d2d3b809b8806a3b5b7c41cefcbd7914e6c0cbb53ecd76
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, indicative of a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. While no scripts were explicitly extracted, the PDF structure and the heuristic firings suggest an attempt to redirect users to a network of potentially malicious or spam-related websites.

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://vipe-events.ch/uploads/1/3/0/6/130621989/130621989.html#reporteros+de+tv+azteca+fallecidos
    • http://carolyn-blackmore.com/uploads/1/3/1/3/131382330/5c21eb.pdf
    • http://graceandfavours.uk/uploads/1/3/0/5/130551325/575ff.pdf
    • http://ultimateguidetoneworleans.com/uploads/1/3/0/5/130546803/gamaj.pdf
    • http://rosemurrinlicsw.org/uploads/1/3/1/4/131407807/vorijedewisusejufex.pdf
    • http://missourichapter7.com/uploads/1/3/0/8/130815213/2705747.pdf
    • http://libertyingod.org/uploads/1/3/0/7/130776272/molofixin_rasevona_taxojujagozafaw_bikeruvuperofit.pdf
    • http://herbalzonesouthafrica.com/uploads/1/3/1/4/131482812/xejufuwa-ferexugeletol-sojodapuzijezes-kinokexepibifa.pdf
    • http://aquaponicsdepot.com/uploads/1/3/1/4/131454567/vilitibakuruz.pdf
    • http://redcedarchildrenschoir.com/uploads/1/3/0/2/130270866/rigoked.pdf
    • http://solitudefloattherapy.com/uploads/1/3/0/5/130588345/vesinogelojalologiv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006652.bin
403fe7c9b54c575763d4f17539b6841f3ae282524425bea06336041d84054284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 10948 bytes
font_01_sfnt_off00008d6e.bin
ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6E 16028 bytes

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