Malicious PDF — malware analysis report

Static analysis result for SHA-256 912d84927e673557…

MALICIOUS

PDF

43.0 KB Created: 2020-06-27 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9870c2f67e174768d715bc990b1757e SHA-1: db5a7656e03f43f0ed2b28b8664ca35efd3974bc SHA-256: 912d84927e673557792fed914fd9c5bc4685a57f3b5f39b2f3baf18cc338cc1a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains URLs that are likely intended to redirect users to malicious content or phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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://files.landsendguildofartists.co.uk/uploads/1/3/0/2/130289663/130289663.html#the+nature+of+chemical+bond+pdf
    • http://801grandleaseofferings.com/uploads/1/3/0/8/130813143/mumejizadiwe-wumuxobogukuk-dujafisexad-mumenagetolosi.pdf
    • http://rudiesolutions.com/uploads/1/3/0/6/130639140/veloro-pojudanunaki-tapiketaf-puworenobafewe.pdf
    • http://vinestreetband.com/uploads/1/3/0/5/130588827/nonak.pdf
    • http://crisprestitocompany.com/uploads/1/3/0/8/130873992/bibixejiwobijezelamu.pdf
    • http://brucebaek.net/uploads/1/3/2/6/132682685/1706985.pdf
    • http://aboldorganizer.com/uploads/1/3/0/6/130622092/9207086.pdf
    • http://mlhconsultancy.com/uploads/1/3/0/5/130542717/925879.pdf
    • http://mail.chardontomorrow.org/uploads/1/3/0/9/130969238/verakalogu_bixesuvu_runen.pdf
    • http://wcc.wayzatachildrensclinic.com/uploads/1/3/1/3/131379945/9cbc8af.pdf
    • https://xuromud.files.wordpress.com/2020/06/gotovofekutaxaz.pdf
    • https://govofakod.files.wordpress.com/2020/06/99756427374.pdf
    • https://wobokaw.files.wordpress.com/2020/06/magaxewojigovasova.pdf
    • https://menanesude.files.wordpress.com/2020/06/dekurusadekuwesile.pdf
    • https://lilimiweko.files.wordpress.com/2020/06/bupikeson.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4f.bin
0dccee1bb3f06b60336d1ae5ac02f9a782709afdb565e89673b0faff2f62c046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 5188 bytes
font_01_sfnt_off00007db8.bin
28f2e059f2694f7d239a43b6de333e27329d3d09b15d22c7ab902ebf179a471f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB8 9952 bytes

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