PDF malware analysis — malicious · ec123b233b67f2f9

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 00:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e762e0651b7de13deea889671aa03147 SHA-1: acefbefd26d5f902374500b16778891063a58893 SHA-256: ec123b233b67f2f91f6c82733ab3454e16c7ef2fcca19ac0fa37064e4764f9dd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 5

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.
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://huntic.ru/uplcv?utm_term=ludo+offline+game PDF link annotation
- http://www.prctech-th.com/ckfinder/userfiles/files/94983749300.pdfIn PDF document text
- http://criminisiepartners.it/userfiles/files/gumasebuzilivujile.pdfIn PDF document text
- https://yantrasearch.com/ckfinder/userfiles/files/zafize.pdfIn PDF document text
- https://haltia.mx/sii/ckfinder/userfiles/files/93795787484.pdfIn PDF document text
- http://studiovalecchi.it/userfiles/files/7104680007.pdfIn PDF document text
- http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/gojodobep.pdfIn PDF document text
- http://gesundezellen.com/neu/userfiles/file/99313403876.pdfIn PDF document text
- http://nhasachconggiao.com/luutru/files/mexojo.pdfIn PDF document text
- http://kaymccarthy.com/immagini/file/5953976339.pdfIn PDF document text
- http://agisma.ru/files/pages/files/jitejalepetowidoxej.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919dd99145---bipin.pdfIn PDF document text
- https://www.bramfordgc.co.uk/ckfinder/userfiles/files/voxugemubuteluvokirapa.pdfIn PDF document text
- https://thefertilizergranulators.com/d/files/lutefedi.pdfIn PDF document text
- https://samngaimarble.com/html_upload/file/16725343593.pdfIn PDF document text
- https://ljlconst.com/admin/images/file/38470445731.pdfIn PDF document text
- http://tokyo-sanritsu.com/userfiles/file/tibapezekoniwiv.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb82784f0e---87269469664.pdfIn PDF document text
- https://limsurempat.com/contents/files/20281102167.pdfIn PDF document text
- https://haruhonpo.com/upload/haruhonpo/files/58538865538.pdfIn PDF document text
- http://zartmobilia.com/userfiles/file/20210906152017.pdfIn PDF document text
- https://ratco-hardware.com/Ups/files/sokuwisozajajaduwodira.pdfIn PDF document text
- https://kolegium.inaheart.org/upload/files/dajotuxepujumosu.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/posunozewaxo.pdfIn PDF document text
- http://szm.hu/userfiles/file/gevetofigopi.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_off0000af8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c7a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7A0	16624 bytes
SHA-256: `7d176eea558739799e8d18b2585c8ef86b022e6bee20f31308407bbf7a7b426d`
`font_02_sfnt_off0000f137.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF137	10388 bytes
SHA-256: `55e41789f8884c1bedb003a8d96fb0e47c1014d77630449aa3fbfb866c698ff0`

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