PDF malware analysis — malicious · c8493ac9e0ff597a

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 13:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e34d393b1a1e00e200b58644367bb5c7 SHA-1: 7d7f2af4a3f746bc4ec2eb1947eec64678e014e5 SHA-256: c8493ac9e0ff597a1c65508d644c6dd620160e51f3579e814cdf8a9559233244

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's part of a link farm designed to redirect users to potentially malicious content, as evidenced by the numerous external URLs. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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=influence+grade+12+grammar+book+pdf PDF link annotation
- http://proxima-design.cz/files/file/60670711315.pdfIn PDF document text
- http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/19432935392.pdfIn PDF document text
- http://associatedreclaimed.reclaimedoils.com/userfiles/files/zozew.pdfIn PDF document text
- http://balone.net/_upload/file///65950912778.pdfIn PDF document text
- http://yjbiotech.cn/upload/files/70210562278.pdfIn PDF document text
- http://kpdb.org/userfiles/files/vowefok.pdfIn PDF document text
- http://ituor.ir/basefile/chartermeinfo/files/12717596034.pdfIn PDF document text
- http://nowator-zpu.pl/userfiles/file/xanekurizoxe.pdfIn PDF document text
- http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lopuvidakeferasaroxade.pdfIn PDF document text
- http://rudolphalexander.com/uploads/files/lirulopojogofokudalojoz.pdfIn PDF document text
- http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/manevetedabe.pdfIn PDF document text
- http://rentaruedas.com/files/others/tabavowexap.pdfIn PDF document text
- http://marcth.pl/media/fck/file/vavogisuvaxalasuguk.pdfIn PDF document text
- https://fceresources.com/ckfinder/userfiles/files/bemudofarulimasuwubo.pdfIn PDF document text
- https://073741256.com/uploads/files/202109071605401661.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903044725237008.pdfIn PDF document text
- http://leebyunghun.org/new/upload/board/files/mixelupi.pdfIn PDF document text
- https://intersensor.ro/v2011/Files/fck_upload/file/zevetutebuxolosirivugizoj.pdfIn PDF document text
- http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/71099611472.pdfIn PDF document text
- http://eshop-kocicinadeje.cz/files/file/wugokulibejelanugeka.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/lisomoreroxos.pdfIn PDF document text
- http://insureavisitor.com/userfiles/file/webojorosuramoros.pdfIn PDF document text
- https://doluhosting.com/calisma2/files/uploads/sagoxiremowudilisezu.pdfIn PDF document text
- http://proallprint.com/userfiles/files/26236162748.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_off0000e10c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE10C	17368 bytes
SHA-256: `006da9f8cded0998a4334c51c421d1f8c290529feb76609c850947c8748834a0`
`font_01_sfnt_off00010df7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001260e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1260E	11060 bytes
SHA-256: `03069473aa5c5497400e3ff97dc6447b2860d947efcb70f6b9b62c2f21c28a0e`

Open this report in the interactive analyzer, or submit your own file for analysis.