PDF malware analysis — malicious · 7411b581fb3932ca

MALICIOUS

PDF

42.5 KB Created: 2020-03-12 02:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 7ad0cc9d2b763328ffceee077b7cd0a4 SHA-1: b1d00bfabbce4310b844b458db06afd4cb3bc616 SHA-256: 7411b581fb3932caffb47571d737143a5242228cce160b5e3e7d132cf2d0c0b2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristic findings. This suggests the primary purpose is to redirect users to potentially malicious or spam-hosting websites.

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://bet365youhui.br3h.com/uploads/1/3/0/2/130288552/130288552.html#fraction+decimal+percent+table+worksheet
- http://417md.com/uploads/1/3/0/7/130775405/6444922.pdf
- http://www.twistedbeauty.ca/uploads/1/3/0/4/130483265/vodilopu_bavuzisub_pidufogakagoba.pdf
- http://mx.holisticmassagetraining.org/uploads/1/3/0/8/130874497/novubagaz.pdf
- http://www.aniedo.com/uploads/1/3/0/5/130550915/9491557.pdf
- http://drkerriesmedley.com/uploads/1/3/0/6/130620441/lafujiwe_marekado_zubofige.pdf
- http://madthreadz.com/uploads/1/3/0/7/130776167/364ff8d2425e9.pdf
- http://makeitwordpress.com/uploads/1/3/0/6/130604295/katiwuxekedos.pdf
- http://fietsverhuurbreda.nl/uploads/1/3/0/3/130313130/6807979.pdf
- http://froggtoggsdirect.com/uploads/1/3/0/2/130288359/9277422.pdf
- http://x-ovarvs.com/uploads/1/3/0/5/130550874/289693.pdf
- http://www.bluespringsalpacas.com/uploads/1/3/0/6/130605433/8000618.pdf
- http://baxizuqiu.f18.ebkf.org/uploads/1/3/0/5/130550825/c53729a4ff.pdf
- http://www.beachviewtravelagency.com/uploads/1/3/0/4/130483871/toxupimoluzoxa_nevapope_rumoketap.pdf
- http://mail.mygeoprobe.com/uploads/1/3/0/5/130550828/bonoteroxavenoru.pdf
- http://bethechangenw.org/uploads/1/3/0/5/130551206/taniselebisofev-lezivajadogi-gawerubozof.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/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000684b.bin` `5f0f21538bda5566e4c5f93e78c8d4c3681f05a2fb6b9162348375c44639846d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x684B	7924 bytes
`font_01_sfnt_off0000870a.bin` `f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x870A	16204 bytes

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