PDF malware analysis — malicious · f92fc2c262fe3ab3

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 04:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: ce4eb7470a43a1f2d34f4ea7d37975af SHA-1: 8a9161da404a8acb051cd4e5e28f89c45f541b89 SHA-256: f92fc2c262fe3ab3f76342ae509072d0a72877dd9fe41c7b001efffa5710df62

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=android+system+webview+cannot+enable PDF link annotation
- https://cpsguffanti.com/uploads/file/95456897382.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/96978811676.pdfIn PDF document text
- http://walosports.cl/userfiles/file/wevuxo.pdfIn PDF document text
- https://lanjutpt1.com/contents/files/mazamirewamuminixadeg.pdfIn PDF document text
- https://intervalhousehamilton.org/ckfinder/userfiles/files/zaxaxotosa.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/vewikigonaxexupolafi.pdfIn PDF document text
- http://infiniti.e-library.tw/uploads/files/pisin.pdfIn PDF document text
- http://sgrappresentanze.eu/userfiles/files/zufuxapivulozakolemap.pdfIn PDF document text
- https://www.asoriofrio.org/ckfinder/userfiles/files/makivorelade.pdfIn PDF document text
- http://studiogalata.it/userfiles/files/96280618139.pdfIn PDF document text
- http://regalmotors-jp.com/js/upload/files/zofuxafe.pdfIn PDF document text
- http://dalboncostruzioni.it/userfiles/files/telidesaki.pdfIn PDF document text
- https://khmernative-rice.com/userfiles/file/zujukanigekizebumokupi.pdfIn PDF document text
- http://czernavendeghaz.hu/admin1/file/86742912574.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210914093848_bz4l7f.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/69337876318.pdfIn PDF document text
- http://deaprogettazioni.it/userfiles/files/15468817782.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16147963cbb48e---58372426952.pdfIn PDF document text
- http://hwayinn.com/image/files/20210908_102234.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1651c9b5---50168232924.pdfIn PDF document text
- https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kezero.pdfIn PDF document text
- https://unitytradecapital.com/ckfinder/userfiles/files/17061843002.pdfIn PDF document text
- https://10fci.net/userfiles/file/varogorarijamij.pdfIn PDF document text
- http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210920100954.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_off0000d90d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD90D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f11f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF11F	17708 bytes
SHA-256: `126e466381aa9a3381ee4285241607773c66657026c227f076f82b814a3aea4c`
`font_02_sfnt_off00011f5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F5E	10916 bytes
SHA-256: `7f72c379bbe1b087e5355a4bc2fa3d21e6056c39ddbf101af3496244df377ef4`

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