Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4429fcc3b4b020b…

MALICIOUS

PDF

34.4 KB Created: 2020-04-14 15:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0bfd6809c355113a5c5df84ac585ebd8 SHA-1: 949452d56baf6ebec429699ab1b3ef8c8ac81a81 SHA-256: e4429fcc3b4b020b37ec3a10f9efdfda209164c017c223eb94c7899e4e278365
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which host further PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Xsl stylesheet tutorial' and 'wkhtmltopdf', likely a lure to disguise the malicious intent of redirecting users to potentially harmful content.

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://holbaeksymfoni.com/uploads/1/3/0/6/130620687/130620687.html#xsl+stylesheet+tutorial
    • http://makeupandexhale.com/uploads/1/3/0/6/130621715/pitavarizobifiw.pdf
    • http://easton-pa-truckingaccidentlawyers.com/uploads/1/3/0/8/130874354/1712680.pdf
    • http://buythef-ckingdip.com/uploads/1/3/0/6/130604699/fijovel_xupukex.pdf
    • http://ggaa-lb.com/uploads/1/3/0/5/130539783/jedezukikob-pikufev-nameredilore-xujakigujaju.pdf
    • http://vicsdailycafe.com/uploads/1/3/0/6/130604045/3997236.pdf
    • http://australianinvestigators.com/uploads/1/3/1/4/131406020/supipunuziros-domug.pdf
    • http://vicsdailycafe.com/uploads
    • 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_off00006100.bin
e73d3cab248cd17bcb72003507a790dd06a82ff54379600ba7152826580e1c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 7720 bytes

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