Malicious PDF — malware analysis report

Static analysis result for SHA-256 bceb31aaff7faf3b…

MALICIOUS

PDF

36.6 KB Created: 2020-04-04 15:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9fc3a7c08aebffae9ade63e472d24a40 SHA-1: 13c908c15453246c8d4e498c9ce4b065d6cf4a36 SHA-256: bceb31aaff7faf3bbcb791a35b2d1ca1bd3d406f4fc6cf3a076229844dc32b58
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The document body contains text related to the circulatory system, which appears to be a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wasubastudios.com/uploads/1/3/0/2/130272318/130272318.html#partes+del+sistema+circulatorio+y+sus+funciones+en+ingles+y+espa%C3%B1ol
    • http://vlaardingen.mylifeslim.com/uploads/1/3/1/4/131406784/serufiwafaxuje-kinadefoma-fetemasoba-paleg.pdf
    • http://worldmarketnc.com/uploads/1/3/0/3/130379146/nubesud.pdf
    • http://www.hiwar-watani.org/uploads/1/3/0/4/130488616/fefiza_duxurorilore_jopozave.pdf
    • http://moonshinemanorweddings.com/uploads/1/3/0/6/130639962/5658531.pdf
    • http://ecommercesuppliernetwork.org/uploads/1/3/0/6/130621059/renudagajukosaretowa.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_off00006384.bin
a7917218cfbcbfc16f36dc457b1dd311feafb7f144064bef7cad5c2adfe37f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 8512 bytes

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