Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41d4f8c9f1e2643…

MALICIOUS

PDF

35.3 KB Created: 2020-06-02 16:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d22c03195d2d9be1f2b61b4857b7067 SHA-1: a0e5b7d92d5a920cc0bc41cd2b833692a4196465 SHA-256: b41d4f8c9f1e2643e92ccc76fc5ae4254fb089950ae9ad60ae517018eaa5bc61
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO spam operation. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The document body itself is largely unreadable, but the presence of numerous URLs points to a redirection or content distribution scheme.

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://lisassweets.net/uploads/1/3/1/4/131452785/131452785.html#the+art+of+tinkering+pdf
    • http://frankandersonaaacleanaway.com/uploads/1/3/0/7/130739052/nudem-vikaxubifow-tezituduxak-wasiloroniraful.pdf
    • http://dieselgeneralcontracting.com/uploads/1/3/0/7/130738881/sofavepawevor.pdf
    • http://uganeuro.com/uploads/1/3/1/6/131637395/69de7e0d66734c.pdf
    • http://baijialezenyangying.br3h.com/uploads/1/3/0/6/130620567/3781069.pdf
    • http://plussizebridalgownsinma.com/uploads/1/3/1/0/131070334/2cff59.pdf
    • http://websmarttherapists.com/uploads/1/3/1/4/131408616/9ddcaeeace74.pdf
    • http://edgewateracresfarm.com/uploads/1/3/0/5/130551115/9115daf13519721.pdf
    • http://importdca.com/uploads/1/3/0/2/130288549/galak_zijomiz_vafiwu_gutoxajeledodib.pdf
    • http://lisassweets.net/uploads/1/3/1/4/131452785/terms.html
    • http://lisassweets.net/uploads/1/3/1/4/131452785/dmca.html
    • http://lisassweets.net/uploads/1/3/1/4/131452785/policy.html
    • http://lisassweets.net/uploads/1/3/1/4/1314527
    • https://janivuveraku.files.wordpress.com/2020/05/kapaniwosasixapeboxejena.pdf
    • https://jarojadum.files.wordpress.com/2020/05/56045374313.pdf
    • https://tujozoxi.files.wordpress.com/2020/05/jejapatawomurevut.pdf
    • https://lotediw.files.wordpress.com/2020/05/xaxenokezesise.pdf
    • https://soxufososuk.files.wordpress.com/2020/05/mifedexubukufilinegosan.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_off00005e64.bin
a6aa2eb7cfc1954d5abdf3c7ed124a3531971b9bfd2382ce312f20736681395b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 10380 bytes

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