Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a6eee8e546263e…

MALICIOUS

PDF

66.1 KB Created: 2020-06-12 04:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf1e3c5fbf953e600b80cea6d53d94fb SHA-1: be8be0f0b1df7e246886996ff5a467fe8416fb50 SHA-256: 54a6eee8e546263e31fa647ce176fa8e41a5d7a4fa53a386a16f328dcc3c4868
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'integrated music lesson plans' and the wkhtmltopdf application, indicating a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of suspicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://herbandfeather.org/uploads/1/3/0/4/130435783/130435783.html#integrated+music+lesson+plans
    • http://balholmarchaeologicalillustration.com/uploads/1/3/0/5/130589328/lujuwibi.pdf
    • http://mytexanlife.com/uploads/1/3/0/4/130489241/8963345.pdf
    • http://yikaloaraya.com/uploads/1/3/1/4/131438556/2558833.pdf
    • http://andreabauchowitz.com/uploads/1/3/1/3/131380341/ravexov.pdf
    • http://remodelorlando.net/uploads/1/3/0/4/130483906/xozomon.pdf
    • http://exquisitepoolsandlandscapes.com/uploads/1/3/1/6/131606809/botufex_debeguk.pdf
    • http://noreply-27.info/uploads/1/3/0/5/130541462/jinivafane.pdf
    • http://smartstateelectricalservices.com/uploads/1/3/0/6/130621351/najipajurujapob_jatubezusirez_luragatudojudig_nofesebuvebu.pdf
    • http://doubleheartsoapcompany.com/uploads/1/3/0/3/130312952/2612be8f6ac7.pdf
    • https://fesedaxunag.files.wordpress.com/2020/06/26217735420.pdf
    • https://kulovop.files.wordpress.com/2020/06/rolegituxon.pdf
    • https://vuvopiberuw.files.wordpress.com/2020/06/nidurumokesutitotoromosij.pdf
    • https://funererole.files.wordpress.com/2020/06/guxofedefolujegir.pdf
    • https://gakirebeb.files.wordpress.com/2020/06/kigusem.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_off0000d73a.bin
56fd29f53cbb0d6a51df66605bc2f928125fca185a6c36182986aef25b5c3eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 11084 bytes

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