Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cdf98107ac50e6…

MALICIOUS

PDF

38.8 KB Created: 2020-05-31 19:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8879d254de2149ffb4f3422bbf7d48b SHA-1: 9d37c49c915080b38c7e28c35034ee73675434a8 SHA-256: 82cdf98107ac50e697b84db6a90ddd52579673a0901f6f2ae3c14ad5340fc3dd
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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
  • 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://bejeweledboxboutique.com/uploads/1/3/0/8/130874678/130874678.html#bootstrap+pdf+viewer
    • http://taylorbrownfit.com/uploads/1/3/1/4/131437383/d2226.pdf
    • http://westernwindowtinting.org/uploads/1/3/0/4/130435862/nugatodumedunoseku.pdf
    • http://thebringinghomebluecharity.org/uploads/1/3/1/6/131637224/sulubusozaj-nularowunajudo-letami.pdf
    • http://ipromiseglobal.com/uploads/1/3/0/2/130289186/razekelerivizatul.pdf
    • http://lwhomebuyers.com/uploads/1/3/1/4/131410299/godimewajow-tipugidotigoz-xobomaxefotuf-geritevosukijap.pdf
    • https://badumazu.files.wordpress.com/2020/05/91758593679.pdf
    • https://tinugezova.files.wordpress.com/2020/05/jomuz.pdf
    • https://juvavapu.files.wordpress.com/2020/05/61184998609.pdf
    • https://pekuzapodomi.files.wordpress.com/2020/05/zuvomuzuvo.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/lesimisusemekogewevu.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_off000066c4.bin
4949246aa451078cbb9f4dbbe51588d831cbd5f5cf682dd65f25185044698e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C4 12480 bytes

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