PDF malware analysis — malicious · 9e4b25f2565a3eaa

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 10:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b12b8a88c88bf0a52847be8c4c48fed0 SHA-1: 867dfc9808a0b9e18649347c319faf28c1d41dd4 SHA-256: 9e4b25f2565a3eaa38e963625113acf8b41bd5912820379dc8aca8fd18976f80

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts suggest this document is part of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=sao+war+of+underworld+part+2+episode+8 PDF link annotation
- https://fobh.net/userfiles/files/10785507079.pdfIn PDF document text
- https://propiedades.net/ckfinder/userfiles/files/84099623007.pdfIn PDF document text
- https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
- https://byocamacho.com/ckfinder/userfiles/files/54019172178.pdfIn PDF document text
- http://kompassztuki.pl/Image/files/govefeno.pdfIn PDF document text
- http://rana-international.com/userfiles/files/mukofibowekiramivuvu.pdfIn PDF document text
- http://vrajacreation.com/uploaded_files/userfiles/files/tomugavum.pdfIn PDF document text
- https://wittnebel.dk/file/duxereregopog.pdfIn PDF document text
- http://www.premiumimport.nl/ckfinder/userfiles/files/borisag.pdfIn PDF document text
- http://bunny888.com/ckfinder/userfiles/files/18011818029.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/73916846316.pdfIn PDF document text
- https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/wibow.pdfIn PDF document text
- https://cafesca.mx/ckfinder/userfiles/files/sobosolodi.pdfIn PDF document text
- http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/79659692629.pdfIn PDF document text
- https://khambenhxahoi115.com/images/files/tukonimites.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mqq4kededhg31gel9je7n06s78/jobatasevuxefufiratuvub.pdfIn PDF document text
- https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jujuwurejaledukuvaj.pdfIn PDF document text
- https://digireg.it/upload/24161099410.pdfIn PDF document text
- http://skupka23.ru/upload/m/90026450620.pdfIn PDF document text
- https://ctners.com/ckfinder/userfiles/files/49806324005.pdfIn PDF document text
- http://bhttourist.com/upload/fckimagesfile/filokuxemudetomem.pdfIn PDF document text
- http://ambvetfanini.eu/userfiles/files/54083752290.pdfIn PDF document text
- https://businesslife.com/content/files/23079172840.pdfIn PDF document text
- http://digifast.cz/userfiles/8751972778.pdfIn PDF document text
- http://anm-av.de/uploads/files/dowoligemozikidijerufanu.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_off0000d99f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD99F	17720 bytes
SHA-256: `dd744948fb8ee39d4a50e65e665a2bfe0792f561217779a60aed9d0ad6a65743`
`font_01_sfnt_off0001079a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1079A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011fb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FB1	11080 bytes
SHA-256: `6058292d1dbd607827895418c30a3096281075bfc533fb650dd1596b9ecd7f89`

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