PDF malware analysis — malicious · d8f5953d2b431577

MALICIOUS

PDF

69.4 KB Created: 2020-03-08 02:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 2614596575f4d3489acd123c866681fe SHA-1: ebd287710debb1180b27c64a3e0df66e281297aa SHA-256: d8f5953d2b43157727ea7558561bd16a7d41afb7ec9f80ef8c976e4fe02ab398

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains. This is indicative of a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'rheumatic fever' and 'rheumatic heart disease', likely used as a lure to attract users to click on the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://mail.evylareau.com/uploads/1/3/0/7/130775413/130775413.html#incidence+of+rheumatic+fever+and+rheumatic+heart+disease
- http://apayservices.net/uploads/1/3/1/0/131070498/kiwedegaboz.pdf
- http://pyplservice.com/uploads/1/3/0/6/130604731/dijebevaxelufofog.pdf
- http://chinasummercamp.org/uploads/1/3/0/2/130271157/dovurosoniwedilosu.pdf
- http://drzen.co.uk/uploads/1/3/0/6/130604516/godalokadur.pdf
- http://www.katiekilgore.com/uploads/1/3/0/5/130544043/kuroteguseto_gidulumibap_wavoriwigodozat.pdf
- http://drjulieneil.preview.pethealthnetworkpro.com/uploads/1/3/0/5/130543870/3585917.pdf
- http://papilloncreditorservices.com/uploads/1/3/0/6/130640225/9261149.pdf
- http://novelnaturesolutions.com.au/uploads/1/3/0/7/130738614/411170b.pdf
- http://myapotheka.com/uploads/1/3/0/4/130483215/699fd9d9f14.pdf
- http://fleximeet.org/uploads/1/3/0/4/130490461/zudolaresuzedoz_goboliwuk.pdf
- http://kdpproductions.com/uploads/1/3/0/6/130639256/mexiba.pdf
- http://35andunder.com/uploads/1/3/0/3/130324152/repupunukefa_finexevaniso.pdf
- http://newriver-yoga.com/uploads/1/3/0/6/130621134/2650488.pdf
- http://kobrathelabel.com/uploads/1/3/0/3/130379227/38b0672f7388.pdf
- http://somorra.com/uploads/1/3/0/5/130540266/5850781.pdf
- http://mrsscunningham.com/uploads/1/3/0/3/130379391/3012639.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d890.bin` `712722b7000b69948440ee8e485b7da3ec84026e628491c1db1672ee8b688483`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD890	9852 bytes
`font_01_sfnt_off0000fc25.bin` `4e9ae17c41f053e7ad2cff4c16f4465db96732130fdde230725ded2fe80853ad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC25	3156 bytes

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