PDF malware analysis — malicious · 167d0325a118e861

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 11:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: d65a728c9a20bf4287eaa4767755bdc1 SHA-1: 6d0b99e9287ec42e1b4677333f25994aee90b055 SHA-256: 167d0325a118e8614cd6b7df5c4a87183ed8eef07529043ed38421cead4665c2

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for malicious links.

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 https://ketchas.ru/uplcv?utm_term=apk+porn+tv PDF link annotation
- http://associatedreclaimed.com/userfiles/files/vivuluge.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1632300394.pdfIn PDF document text
- http://kehlux.lu/userfiles/files/xonunijufap.pdfIn PDF document text
- https://thegioibaobicarton.com/Images_upload/files/49202791536.pdfIn PDF document text
- https://www.puskinas.lt/ckfinder/userfiles/files/11076213015.pdfIn PDF document text
- https://khogiaydantuonghanquoc.com/images/news/file/97127088687.pdfIn PDF document text
- http://colantuono.it/userfiles/files/86727375989.pdfIn PDF document text
- https://kaptenhoki.com/contents/files/dapikure.pdfIn PDF document text
- https://www.domaine-vrignaud.com/ckfinder/userfiles/files/40167842637.pdfIn PDF document text
- http://bio-scan.com/userfiles/file/vudixofelojuverixum.pdfIn PDF document text
- https://locktactyuma.com/ckfinder/userfiles/files/mosebunuvixunenefez.pdfIn PDF document text
- http://floridadressyourhome.com/uploaded_files/userfiles/files/29328568732.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9d70b25f---zekuwiwewenowinegaz.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632535844.pdfIn PDF document text
- http://www.dgtrans.co.th/login/ckfinder/userfiles/files/8918499030.pdfIn PDF document text
- http://madonnina.info/userfiles/files/81073809368.pdfIn PDF document text
- https://mattress-leader.com/media/butokuro.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/aafefa5493d6654a8a740be6ff172f5a/43128822427.pdfIn PDF document text
- http://nifaelectronics.com/userfiles/file/72933629613.pdfIn PDF document text
- http://thestarbusan.com/FileData/ckfinder/files/20210927_12ACC891E8967BAE.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/74434250788.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_off0000ae0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE0F	17876 bytes
SHA-256: `2529af4ee0614b6672678d32746673f44c53e65d2f4a29fe893b37e096c9ce17`
`font_01_sfnt_off0000dbaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBAF	9784 bytes
SHA-256: `4c1a61969bf8a3e63e1ac4d8c2d7f653db6c3e4b3c5fd3a9883d8e00db3cb3c6`
`font_02_sfnt_off0000f143.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF143	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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