Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc477e5187090c…

MALICIOUS

PDF

78.4 KB Created: 2020-04-09 10:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a92bc728a7dbafcf34f0f6599730898d SHA-1: e26d92eac60c9f3d5e92c5886c3400298f886648 SHA-256: adcc477e5187090c68b72a9b4f2d3251f9d1464dbd7c2c13fb47cbbd5840c625
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unrelated domains with numeric or generic slugs, indicative of a link farm or SEO spamming operation. The document body contains text related to 'Layla eric clapton acoustic' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://djspizza1.com/uploads/1/3/1/3/131380730/131380730.html#layla+eric+clapton+acoustic
    • http://elevo.net/uploads/1/3/0/5/130590158/bimivimivadavu.pdf
    • http://stephenshooster.com/uploads/1/3/0/7/130776601/891017.pdf
    • http://jmdconseil.com/uploads/1/3/0/3/130323172/19c45d482.pdf
    • http://q-term.de/uploads/1/3/0/4/130488669/xunaxuxita-pabupamexumarul-povir-zuvedur.pdf
    • http://shewttv.com/uploads/1/3/0/6/130639903/fcc5900b73a51e.pdf
    • http://blackbusinessunite.com/uploads/1/3/0/4/130489144/vojetudexewulinexo.pdf
    • http://nerdygeekgifts.com/uploads/1/3/0/8/130874338/tejojizak_namadawulo_vilagurokuvi_saxiwegi.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_off000108e4.bin
ff105169b77b2a36ac08e8e44aa9357df9745c7168db1d9667c51fc9e2b55499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 9892 bytes

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