Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaca6f90e35a31fe…

MALICIOUS

PDF

39.6 KB Created: 2020-06-07 08:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c2d7ac025859f424875ba8ac315730 SHA-1: 0b3e17c37281475caad9850cee24dca5ac9e14aa SHA-256: eaca6f90e35a31fe162f09ca8e0c9a3d8d27353a6ef2b3cf54569c4c1411fca3
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body suggests a deceptive lure related to 'disinfection'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of external URLs, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://d4sav.live/uploads/1/3/1/1/131163690/131163690.html#ara%25C3%25A7+gere%25C3%25A7+dezenfeksiyonu
    • http://rothesayclinic.com/uploads/1/3/0/7/130740200/kibutabanejole-kadomafijim.pdf
    • http://hostmaster.innovomedical.com/uploads/1/3/1/4/131408033/9888493.pdf
    • http://cirkas.info/uploads/1/3/0/8/130813478/tolutip.pdf
    • http://dawnwilcoxlcsw.com/uploads/1/3/1/3/131380109/a12e0908a58405.pdf
    • https://difovasiven.files.wordpress.com/2020/06/15695979070.pdf
    • https://gonotof.files.wordpress.com/2020/06/wonefopebekot.pdf
    • https://senexivoxol505468380.files.wordpress.com/2020/06/momazevakomajufobajon.pdf
    • https://xobaxelofutu.files.wordpress.com/2020/06/11610306539.pdf
    • https://witugabepuz.files.wordpress.com/2020/06/14961597622.pdf
    • https://xedebixudo.files.wordpress.com/2020/06/fomegaxivujeji.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_off00006a67.bin
6bd12d72e0cab4b6f0065b20da590fa46fcb839ff161b393d10417db8929c67b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 12976 bytes

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