Malicious PDF — malware analysis report

Static analysis result for SHA-256 925ce40b7d407cfa…

MALICIOUS

PDF

34.5 KB Created: 2020-04-13 06:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a763e0041e9952a1f78f83cb4515bdd7 SHA-1: 748f3eecb07aa124c98e1b5310b8a246770ef627 SHA-256: 925ce40b7d407cfa0cadd779b175580b6a840430de451e3fa05c43a5a152c3dc
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body suggests a lure related to language exercises, which is likely a pretext to drive users to these malicious links. 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 0.9985

Heuristics 3

  • 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
  • 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://noquest.net/uploads/1/3/1/1/131163563/131163563.html#passato+prossimo+e+imperfetto+esercizi+pdf
    • http://simplyjesusradio.com/uploads/1/3/1/3/131380641/motugumozidekizelisa.pdf
    • http://brisbanebabylady.com/uploads/1/3/0/7/130775843/noledo.pdf
    • http://ekcoelearningcommons.com/uploads/1/3/0/2/130288486/7461037.pdf
    • http://drandreasmarx.com/uploads/1/3/0/8/130813378/1616338.pdf
    • http://abrahamandjesus.org/uploads/1/3/1/4/131453208/tagupivitapisonotejo.pdf
    • http://loveyoursmilestudios.com/uploads/1/3/0/7/130776374/zariv-koxusuv-barobo-refugixe.pdf
    • http://drandreasmarx.com/uploads/1/3/0/8/130813
    • 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_off00005dbd.bin
de20657708bfcff7bc0375188111c1db0f8b2000b2e1a4a2335d81eecfcd886f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 8492 bytes

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