PDF malware analysis — malicious · c6f6c26f5d4a1863

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 05:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2dd8163b1dbcf7601b574bf05b83db5a SHA-1: 59ecf4f2f58a1ef3095c4b9f68a863e0f00ab3b9 SHA-256: c6f6c26f5d4a1863a685e9154b99283d2f62109fded7ca4378b5f1a0efddda8d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. This structure suggests a link farm designed to distribute further malicious content or lead users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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://geluidsadviesnederland.nl/ckfinder/userfiles/files/mewatapoxafi.pdf In PDF document text
- http://enidental.com/userfiles/file/20210904110933.pdfIn PDF document text
- http://dkkarsin.pl/img/upload/files/12632622566.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210912215142172614370.pdfIn PDF document text
- https://securitydm.net/slicice/file/20743095376.pdfIn PDF document text
- http://hkacca.com/userfiles/40442560389.pdfIn PDF document text
- http://refinerlink.com/userfiles/file/40897984361.pdfIn PDF document text
- http://yonseri.org/userfiles/files/2238532228.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/gufetonigive.pdfIn PDF document text
- http://konsultacjenaukowe.eu/Upload/file/juxevixevuxapomitaroves.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108d4ea2ad---11249579121.pdfIn PDF document text
- http://le-nora.com/userfiles/file/sebisojuziguganetodavi.pdfIn PDF document text
- https://bunian-co.com/other_files/File/7093570718.pdfIn PDF document text
- http://jyotiacademicpress.org/uploads/file/bovesoturojebab.pdfIn PDF document text
- https://pmms-online.com/assets/file/21771895129.pdfIn PDF document text
- https://masterjobintl.com/ckfinder/userfiles/files/vubafupokeluwaderij.pdfIn PDF document text
- https://netron.pt/app/webroot/media/files/kujixewevufubujapi.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/49325470210.pdfIn PDF document text
- https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lulaneneziruwi.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1d7cca46---61724873001.pdfIn PDF document text
- https://samsunyapi.com/userfiles/files/50936704957.pdfIn PDF document text
- http://abwessex.com/uploads/files/60010727669.pdfIn PDF document text
- http://vizugy.hu/uploads/files/files/dilibugipoko.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=material+terminal+apkPDF link annotation
- http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xunezosabivelomexa.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_off0000b9d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9D4	10208 bytes
SHA-256: `9a9dbebb56f6eb1c20612c1a3582021106907607ad123feee7e59ed6787b4ed9`
`font_01_sfnt_off0000d0a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e8b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8B6	18508 bytes
SHA-256: `eb57c661f3dbfd423908ae5db7dec94d358ae0dff7ac18c611b7fa8a3f758fc5`

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