Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7365fe4c2596eb…

MALICIOUS

PDF

45.5 KB Created: 2020-04-10 05:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4d02518f27aa34e40d11ed1ca143116 SHA-1: e9c2aa7b750e9cb4cc8320bf6640746f43cc7166 SHA-256: 4a7365fe4c2596eb199947079f7feb51c9471541fd3e11acb2600fc6f3058ccc
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, a technique commonly used for SEO poisoning or to redirect users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a potential attempt to distribute malware or conduct phishing through a network of linked sites. No scripts were extracted, and the document body is largely unreadable, but the sheer volume of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://dallastravertinepavers.com/uploads/1/3/0/4/130478551/130478551.html#fuerza+de+adhesion+del+agua
    • http://energyelementsllc.com/uploads/1/3/0/5/130589279/7425f576f93e3.pdf
    • http://abbaytelecom.ca/uploads/1/3/0/6/130639899/8877284.pdf
    • http://authnstuff.com/uploads/1/3/0/6/130621781/murema_maxamemarisu_botugapabukike.pdf
    • http://windrhyme.com/uploads/1/3/1/4/131406437/50759c82710c.pdf
    • http://novaculture.org/uploads/1/3/0/6/130639209/vawozolonix_zulav_jeleseze.pdf
    • http://socratefuego.com/uploads/1/3/0/6/130621210/welebowexupinajalis.pdf
    • http://kristienienabercounseling.com/uploads/1/3/0/6/130621557/7833763.pdf
    • http://miguelchambers.com/uploads/1/3/0/2/130272420/reres.pdf
    • http://pineapplecbartending.com/uploads/1/3/0/6/130621579/1119984.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bc.bin
422de30fe66cdcfc92a3da68f8b40de5d3d9f3e2ffc9776bef12cf91ae792182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BC 9068 bytes
font_01_sfnt_off000092a5.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A5 16036 bytes

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