Malicious PDF — malware analysis report

Static analysis result for SHA-256 6575f506536ca0e3…

MALICIOUS

PDF

81.3 KB Created: 2020-03-23 12:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 283cd08ddb82ab382ee3f3e2294b9422 SHA-1: 925127bddf404446d1edbfb8f42a5f706c42d7a7 SHA-256: 6575f506536ca0e35c63f92e39494afc86ece4c6c7b5fc7e652a9e8a633710bf
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, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that likely leads to a malicious payload or further phishing content. The ML classifier strongly indicates maliciousness.

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://brandstormpromotions.net/uploads/1/3/0/5/130551247/130551247.html#cenetec+difusion+catalogo+maestro
    • http://cpanel.indonesianorphanages.org/uploads/1/3/0/8/130814081/ddc7d8e690c194a.pdf
    • http://mytri-conline.com/uploads/1/3/0/2/130272859/5aa14a2.pdf
    • http://zetrocroofing.com/uploads/1/3/0/2/130289772/loxeluboxonimosox.pdf
    • http://137point5bodycare.com/uploads/1/3/0/5/130589098/fd3bbf9f.pdf
    • http://ninapouesi.com/uploads/1/3/0/7/130739557/zitajuliguwadolugu.pdf
    • http://autodiscover.englishforprofessionals.biz/uploads/1/3/0/5/130539357/rawugir-lowor-joxidogopoxixef.pdf
    • http://milestoneshomeinspections.net/uploads/1/3/0/6/130604844/2fc2e7ba527a9aa.pdf
    • http://www.occasionsflowers.designpreviewer.com/uploads/1/3/0/2/130270902/3573452.pdf
    • http://simonwestlake.com/uploads/1/3/0/8/130814290/gulovuxijazaz-tivudukolatil-xelijizukad-zarun.pdf
    • http://tmpropertysolutions.com/uploads/1/3/0/6/130639230/0ea2f50.pdf
    • http://sandyguillot.com/uploads/1/3/0/6/130621819/8338908a.pdf
    • http://www.lizstiresmusic.com/uploads/1/3/0/6/130639310/7223d.pdf
    • http://psykron.org/uploads/1/3/0/7/130775173/demezuvori-dajozu-medabazez.pdf
    • http://brockmillerbasketball.com/uploads/1/3/0/7/130739935/fezabesewaxopejebale.pdf
    • http://www.frankchiafari.com/uploads/1/3/0/7/130775017/koxolenifo.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_off00010284.bin
594b282d29e0438d6852ab96484a2fd0d34e9e0d52265ed4ac2f9b593b87efdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 8252 bytes
font_01_sfnt_off000120b1.bin
ff2c999dac5b8b621eef68842dd9817a607e189f7fc7b150f31955a47982ad19
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16432 bytes