PDF malware analysis — malicious · 8dedae017b21857e

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 23:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 656db1810d8d93053bae9342a81190c8 SHA-1: 82d98d7667e20fafed9242d351f5cc571792bbbb SHA-256: 8dedae017b21857eeefc213d01fe7d46b090431bae09e4412362cc43d71ea705

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=lotr+pdf+download PDF link annotation
- https://araprinter.com/ckfinder/userfiles/files/mezodumajakes.pdfIn PDF document text
- https://studybrilliant.online/app/webroot/img/userfiles/file/potizope.pdfIn PDF document text
- http://fanghsin.com/uploads/files/202109050518046179.pdfIn PDF document text
- http://elcolono.net/userfiles/files/14205705960.pdfIn PDF document text
- http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/65578639676.pdfIn PDF document text
- http://www.jucadent.es/ckfinder/userfiles/files/49757408612.pdfIn PDF document text
- http://dallard.fr/ressource/site-image/files/jumetarirejarusesazalo.pdfIn PDF document text
- http://emusicmarket.com/upfile/board/files/74370998451.pdfIn PDF document text
- http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/sudazetebudodugixasogin.pdfIn PDF document text
- http://studiotecnicomartani.eu/userfiles/files/67348363255.pdfIn PDF document text
- https://davnosti.ru/upload/46930931295.pdfIn PDF document text
- http://smenergy.kr/uploaded/file/346539055613c5619e0b33.pdfIn PDF document text
- http://nexxosrealty.com/userfiles/files/vamalibunulufafit.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/afed3395f2bc937e421d190014d11403/58463570267.pdfIn PDF document text
- http://studiopassarotti.it/userfiles/files/21147572288.pdfIn PDF document text
- http://skipjackpoke.com/ckfinder/userfiles/files/73052215355.pdfIn PDF document text
- http://alphamarino.kz/images/news/file/wexawopodexe.pdfIn PDF document text
- http://ventima.ru/userfiles/file/gifagab.pdfIn PDF document text
- https://fortworthdental.net/cmsCart/upload/file/51919167225.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fd6528aa---regasetexajewisadoni.pdfIn PDF document text
- http://hanasushichoice.com/uploads/files/texogezafujige.pdfIn PDF document text
- https://graveyards-fuj.ae/userfiles/files/kozudidubuzikamegowibub.pdfIn PDF document text
- http://captainkillmite.com/uploads/files/202109051320087440.pdfIn PDF document text
- http://hangquangauto.com/files/92103279737.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_off0000fa0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA0B	17904 bytes
SHA-256: `ddb84cd2451aefc1fe2c48335edebb83f5bb77b0c0b21abc8f09f5f9829dac5f`
`font_01_sfnt_off00012896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12896	10140 bytes
SHA-256: `9dcd6e62b2daef0a1bd47e7c00915362c53339f1015c790ce840292a7d93768b`
`font_02_sfnt_off00013f66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F66	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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