Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53f89c7288f8c7…

MALICIOUS

PDF

30.0 KB Created: 2020-04-14 13:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25fe08a6839da309d3519f4a34876569 SHA-1: fe241f824beffa82c5933aa7985467c29806b0ca SHA-256: ea53f89c7288f8c75d35a96898c47d4325904f79b7a40f42ce923bf5eee53f49
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to a 'Spanish verb ir present tense worksheet' and includes multiple URLs that likely serve as lures. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yvngfox.net/uploads/1/3/1/3/131380279/131380279.html#spanish+verb+ir+present+tense+worksheet
    • http://the-golden-throne.com/uploads/1/3/1/3/131398091/gasubinorid-rixupapotigu-vevizufemikimi.pdf
    • http://d2jmusic.com/uploads/1/3/0/2/130289732/kudapomi.pdf
    • http://jeclemmonscounselor.com/uploads/1/3/0/9/130969607/voxivukipatomarowu.pdf
    • http://daviegaragedoornc.com/uploads/1/3/1/3/131379769/27aaa.pdf
    • http://johnnyvdrum.com/uploads/1/3/0/7/130775961/1274383.pdf
    • http://rustixcustommetalfabricationllc.com/uploads/1/3/0/8/130874126/6257566.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_off00004d98.bin
ccfa091bfa32e55fd6b6240ce109e160f9977462edff7900ec1d251c6e5e673c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D98 8292 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.