Malicious PDF — malware analysis report

Static analysis result for SHA-256 158911c0de3931c4…

MALICIOUS

PDF

44.7 KB Created: 2020-04-06 10:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0a7739e91d702918205a192ec8af013 SHA-1: 8d4cc05ffea342e8ff638581e7ae949ec2779faa SHA-256: 158911c0de3931c48e9e292a23dfb1f31101b559b44c1cd6b0be9dd93ce147da
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous links to unrelated domains supports this. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to drive traffic to potentially compromised or malicious web content.

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://sixtarubio.com/uploads/1/3/0/5/130550891/130550891.html#marco+conceptual+cuantitativo+ejemplo
    • http://claytongatemassagetherapy.com/uploads/1/3/0/2/130287413/maxuroximema_tonelod_magero.pdf
    • http://northbayjudoclub.com/uploads/1/3/0/8/130814329/63cfba5.pdf
    • http://bbirrigationlandscape.com/uploads/1/3/0/3/130379175/7873a.pdf
    • http://taiyakiusa.com/uploads/1/3/0/7/130776692/vazox.pdf
    • http://allcountymobileautorepair.net/uploads/1/3/0/4/130489803/8120641.pdf
    • http://retroactor.com/uploads/1/3/0/6/130603918/b56a4665e0f.pdf
    • http://stellali.com/uploads/1/3/0/6/130620871/7447232.pdf
    • http://starsstripesandgripes.com/uploads/1/3/0/3/130313434/3481115.pdf
    • http://redstickinsurance.agency/uploads/1/3/0/2/130289570/821339.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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_off000078a8.bin
2eaabf538af8318414ae9103122ed1a1144f217b4107eca27dbe1799f1e720df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 1880 bytes
font_01_sfnt_off00008146.bin
c3de0798d8ead03a6713d59bb1a013c2b07ff0c3af78b401510b26f8c3cfc393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8146 9828 bytes

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