PDF malware analysis — malicious · 2766e8e3a2c2ad04

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 02:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a1af02677fd38e5ad7b2e48c2c9dd373 SHA-1: 54e7a562eac2bbfdc1aa1e4f015a05f6190930a1 SHA-256: 2766e8e3a2c2ad0445884ddf805dd6037e4a3b4ac03683ae7e4ff55d89a0ad35

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are embedded within the document's structure, suggesting a phishing or link-farming attack pattern. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document is designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=active+directory+interview+questions+and+answers PDF link annotation
- https://khmernative-rice.com/userfiles/file/28591586674.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/niboruzup.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/48651725144.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8cb8a40c---xeregexivodanolinedud.pdfIn PDF document text
- http://vizugy.hu/uploads/files/64604096545.pdfIn PDF document text
- http://www.heatandgas.com/EditorImages/file/kesodajuxuwedarevojumi.pdfIn PDF document text
- https://misbahelmudii.org/ckfinder/userfiles/files/10968237010.pdfIn PDF document text
- https://www.borzabadi.com/ckfinder/userfiles/files/kejesowubew.pdfIn PDF document text
- https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/65724787954.pdfIn PDF document text
- http://axwelindia.com/uploads/lafaxebiwegu.pdfIn PDF document text
- http://espokebar.com/uploads/files/38302862359.pdfIn PDF document text
- http://ardeche.proximeo.com/ckfinder/userfiles/files/tevelarizivibewokadebe.pdfIn PDF document text
- http://vatlieulamnha.com/media/ftp/file/98853426029.pdfIn PDF document text
- http://goraku-sangyo.com/userfiles/file/44536864779.pdfIn PDF document text
- https://praktijk-fix.nl/userfiles/image/file/juduliguzavuju.pdfIn PDF document text
- http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11078634778.pdfIn PDF document text
- http://nifaelectronics.com/userfiles/file/22011727153.pdfIn PDF document text
- http://bluekeydigital.com/images/pic/file/fotes.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/vebajesovoben.pdfIn PDF document text
- http://master-sign.ru/ckfinder/userfiles/files/55434111087.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a5ef24aa---12620045780.pdfIn PDF document text
- http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/90742722860.pdfIn PDF document text
- http://julianina.dk/upload/file/redozemenojajegunogagusov.pdfIn PDF document text
- http://smartraoptics.com/fck_filemanager_upload/file/vebebamalujosisunijid.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_off0000db71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB71	10812 bytes
SHA-256: `26855a6f675d605198714f1bb771a93fc371e02001d7d622bc57ef4ab7adacc8`
`font_01_sfnt_off0000f46c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF46C	17544 bytes
SHA-256: `5496726c825862e3ca67314a23e61ca7c61ad5adda85f15f17a0f9c9b7718f7d`
`font_02_sfnt_off0001217f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1217F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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