PDF malware analysis — malicious · f1918b2a3735610d

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 18:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 5ce7fd57c42134dc57e00b2b2371972f SHA-1: 0e3c6ed517d077c6b668d911d78bf94206bfb6dc SHA-256: f1918b2a3735610d5e9482176c0dbbb752eccb8522c0e83cf521aedb62026103

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of many distinct hosts and the 'utm_term' parameter in one of the URLs further support a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=advantages+and+disadvantages+of+interview+data+collection+method PDF link annotation
- http://mecateengenharia.com.br/ckfinder/userfiles/files/64505794732.pdfIn PDF document text
- http://funkyspa.net/ckfinder/userfiles/files/31224249034.pdfIn PDF document text
- http://soles2walk.cz/data/file/83692346594.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/3435161024.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0007e2363460d17c10c9936e7460de36/68296813631.pdfIn PDF document text
- https://bostoncake888.com/UserFiles/files/nuzesokumufurepikof.pdfIn PDF document text
- http://cmrivestimenti.com/userfiles/files/gonometusan.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/865a93e1c129d4c5421c9f297810eac8/kanebomimijafoloreliwoxar.pdfIn PDF document text
- https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zopujosuwetozozimokuwaw.pdfIn PDF document text
- http://sowa-architekci.pl/userfiles/files/68781315246.pdfIn PDF document text
- http://floralojistik.com/userfiles/file/gagijipimirifa.pdfIn PDF document text
- http://opsir.eu/files/file/rilumijevokukitib.pdfIn PDF document text
- https://saksisan.com/upload/ckfinder/files/59755492280.pdfIn PDF document text
- https://vantainoidia.vn/ci/userfiles/files/73075829597.pdfIn PDF document text
- http://media-production.net/admin/ckfinder/userfiles/files/bekabezop.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/67565016545.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/68996850826.pdfIn PDF document text
- http://burattinojatek.hu/userfiles/file/9959642551.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/koliduxonur.pdfIn PDF document text
- http://dalboncostruzioni.it/userfiles/files/37047167344.pdfIn PDF document text
- https://nabijdefossa.nl/upload/files/kiguwumo.pdfIn PDF document text
- https://wecareu.net/ckfinder/userfiles/files/90272588990.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_off0000d6cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6CD	11056 bytes
SHA-256: `f2302dd14d7df5f0ceb26525b9dd01d5c650d8697ab1eb0ffd4f701a4c2e54c1`
`font_01_sfnt_off0000f046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF046	17264 bytes
SHA-256: `fc4e27a89dcbe0d7edd88e136dc051a0f6da7deac40d028441d7475ec12fdb14`
`font_02_sfnt_off00011cfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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