Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d1481c63d5e0ee…

MALICIOUS

PDF

34.8 KB Created: 2020-06-02 13:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e21da3761ba3800a01db5b1ef9a7834 SHA-1: 6b759ac19b6df351fbc568561f9d03221fca779e SHA-256: 18d1481c63d5e0eedea5a33e8e564dccf79dfbe0c2b4f89df4552056b5c8f8d8
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, that point to external websites. The document body, though heavily obfuscated, contains references to 'Avira phantom vpn pro key', suggesting a lure to trick users into clicking these links. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple unknown-reputation URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://residencialamoravida.com/uploads/1/3/0/6/130604610/130604610.html#avira+phantom+vpn+pro+key
    • http://adulttoyclub.com/uploads/1/3/0/3/130323139/b5dbf44306efd0.pdf
    • http://chevroletsilverado2005ss.com/uploads/1/3/0/4/130476624/726402.pdf
    • http://afroinvestors.com/uploads/1/3/1/8/131856414/9685928.pdf
    • http://residencialamoravida.com/uploads/1/3/0/6/130604610/terms.html
    • http://residencialamoravida.com/uploads/1/3/0/6/130604610/dmca.html
    • http://residencialamoravida.com/uploads/1/3/0/6/130604610/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dofanadidam.files.wordpress.com/2020/05/97259708046.pdf
    • https://kepoxokop.files.wordpress.com/2020/05/nonivoxadogidogivebojari.pdf
    • https://goduduwatike.files.wordpress.com/2020/06/tufinaxol.pdf
    • https://rufutekinose.files.wordpress.com/2020/05/suzopoximebuzatezane.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cde.bin
08b809de3515bad03401f6fb2bd6ee6d8aed31db3c4d64612b1204c0098e7a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDE 10392 bytes

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