PDF malware analysis — malicious · 9001347b72812961

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 03:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 600b4a7132f3ddacb0b692e1c3c8934e SHA-1: 3a518329bbb41dbaf0f1aea20b50533853839655 SHA-256: 9001347b728129617dd5a36928d4cb6e933cf2bb9751d516ac1f9806e3c255d5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a high ML classifier score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these URLs are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of many external URIs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

Heuristics 4

Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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 https://crewmak.ru/uplcv?utm_term=angry+birds+season+mod PDF link annotation
- http://xinge168.com/uploads/files/20210916100813_714499.pdfIn PDF document text
- http://herium.net/FileData/ckfinder/files/20210913_8E0FE63030A03D34.pdfIn PDF document text
- https://nls.vn/upload/files/89024069947.pdfIn PDF document text
- http://donauwell.at/userfiles/file/4748359086.pdfIn PDF document text
- http://sensi-leszno.pl/userfiles/file/31297308098.pdfIn PDF document text
- http://paglialonga.it/userfiles/files/vupigebew.pdfIn PDF document text
- https://bangprice.com/bangprice.com/beta/cms_image/file/40941414169.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613153c9f3a14---8534726994.pdfIn PDF document text
- http://ongxoanhdpe.vn/upload/files/83900092733.pdfIn PDF document text
- https://tefen67.com/userfiles/files/12613850532.pdfIn PDF document text
- http://ingmarcofaedi.com/userfiles/files/xetivivanasosawolak.pdfIn PDF document text
- http://cukiernia.eu/upload/files/rizuworaniluwikazunuj.pdfIn PDF document text
- https://icbacademy.com/upload/files/37443861726.pdfIn PDF document text
- https://milliondollardesiclub.com/upload_files/featured/files/73423033580.pdfIn PDF document text
- http://gyndoktors.de/ckfinder/userfiles/files/fogurifosogo.pdfIn PDF document text
- https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/didigosufiluluki.pdfIn PDF document text
- http://xn--nellieskche-0hb.de/userfiles/file/67275148088.pdfIn PDF document text
- http://maremania.net/img_pagine/file/59638997164.pdfIn PDF document text
- https://viessmannboilers.ca/fck_upload/file/42430183348.pdfIn PDF document text
- http://paradisetnl.com/FileData/ckfinder/files/20210923_1533333378C587F1.pdfIn PDF document text
- https://ysh.my/userfiles/file/zuzexabaz.pdfIn PDF document text
- https://jin-ji.com/upload/files/gimuwepejegixepafina.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ae3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE3F	10680 bytes
SHA-256: `472942ca5bc9dc115867f2e78f5c0dfc8c3f1871cbd01001a18f8ff0e87ee013`
`font_01_sfnt_off0000c681.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC681	16500 bytes
SHA-256: `0740f4a5ecbffccd5701fb4d1966b2c7cdc512241ec497626049e995c68ed341`
`font_02_sfnt_off0000f066.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF066	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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