PDF malware analysis — malicious · fd554944b1aaa26c

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 00:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03

MD5: c5bb2fd7aace6ffc5183360f5f9b99a0 SHA-1: 9c4312c120307b7fe9b566fc7655f4a01da745a3 SHA-256: fd554944b1aaa26c9d302d70defccc5f4cbffe67f8939cbd3e824a36f84a389c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=formas+de+cargar+electricamente+un+cuerpo+pdf PDF link annotation
- https://pastelbuilders.com/userfiles/file/79055471285.pdfIn PDF document text
- https://vyaspublicschool.com/ckfinder/userfiles/files/dikalijekamiw.pdfIn PDF document text
- https://yoimart.com/upload/file/20210901202632.pdfIn PDF document text
- http://career-id.org/ckfinder/userfiles/files/dowekazoxel.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/94541307505.pdfIn PDF document text
- https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/10143743880.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/zudisiliz.pdfIn PDF document text
- http://palestraarkadia.it/userfiles/files/50704642350.pdfIn PDF document text
- http://www.afurg.com.br/assets/ckfinder/userfiles/files/53323834506.pdfIn PDF document text
- http://hiace-yoshikawa.com/js/upload/files/fuzunofiroguxojozofuxiz.pdfIn PDF document text
- https://pima-alarms.eu/slicice/file/64392314991.pdfIn PDF document text
- https://webkapper.nl/ckfinder/userfiles/files/boxopabukiziguna.pdfIn PDF document text
- https://morabia.fi/images/file/bogabudifanozurizowaze.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/19321a14f9e4291be7a3ec14f143df75/doratevow.pdfIn PDF document text
- http://aviteksural.ru/admin/ckfinder/userfiles/files/nixinuzamubo.pdfIn PDF document text
- https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b77kjhai612lp43l3equg6ig5h/16061545980.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907031057253408.pdfIn PDF document text
- http://doo-san.com/userfiles/file/20210901161711.pdfIn PDF document text
- https://sandp-engineering.com/ckfinder/userfiles/files/91057947164.pdfIn PDF document text
- https://khmernative-rice.com/userfiles/file/68544502204.pdfIn PDF document text
- https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/gomipamuzitejovabor.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/dulolerefon.pdfIn PDF document text
- http://nyett.hk/uploads/news/files/94361467153.pdfIn PDF document text
- http://urgentcarepb.com/userfiles/file/pijorafokafunaxukikib.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_off0000e237.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE237	11040 bytes
SHA-256: `1b1ff6a592588fa6024cf39adbcf1c6fb2c69da44d9007b99c12cb3454680a65`
`font_01_sfnt_off0000fba1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA1	18380 bytes
SHA-256: `09ec3d982627c48a3fa257ca24040510bfc590e66954872510e08c5b38fc66d9`
`font_02_sfnt_off00012a42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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