PDF malware analysis — malicious · cbae3de50a3bd27b

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 03:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 526df5b7669fde5cc132842ecdbd4a53 SHA-1: b2ec0726c6a7fc0b3a320f459f093ca66a812d7a SHA-256: cbae3de50a3bd27bc6324146f498dc75fa8f8276569b5a5ee25e58873b087850

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user to malicious sites.

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://synerhu.ru/uplcv?utm_term=how+do+i+backup+data+on+my+sd+card PDF link annotation
- https://landtop.com/filespath/files/20210901232201.pdfIn PDF document text
- http://ergakiland.ru/files/files/sopirozununupuvo.pdfIn PDF document text
- https://journeywithmypet.com/ckfinder/userfiles/files/janirugokubatufelurem.pdfIn PDF document text
- https://daaeportrett.no/upload/file/80661409630.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/49321730137.pdfIn PDF document text
- https://granitabrasive.ro/editor_up/jivowejegeleto.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136702d623bf---jexokegopoti.pdfIn PDF document text
- https://perfecthospital.org/ckfinder/userfiles/files/21892401519.pdfIn PDF document text
- https://pui-vital.ro/msg_media/file/bekibobukotuxinazajesexo.pdfIn PDF document text
- https://concurs-euclid.ro/upload/fck/rozurelipuxu.pdfIn PDF document text
- http://faw-asia.com/image/upload/files/28955197314.pdfIn PDF document text
- http://coumert.com/images/file/nipinikiluja.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/nemeketimas.pdfIn PDF document text
- http://tatishev.ru/admin/ckfinder/userfiles/files/gobijokiwoxutusi.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c4ad8aed---37468717293.pdfIn PDF document text
- http://foxgraphics.paulsfashion.in/files/99988807605.pdfIn PDF document text
- https://apexsafetyproducts.com/ckfinder/userfiles/files/55113716148.pdfIn PDF document text
- http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/xolokajelutarobe.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/tinene.pdfIn PDF document text
- https://floridahouselottery.com/test/userfiles/file/fumajax.pdfIn PDF document text
- http://ltptech.vn/uploads/userfiles/file/pegivitifuf.pdfIn PDF document text
- https://znalac.com/userfiles/file/xevekedimajatarelokafe.pdfIn PDF document text
- http://rockhouseschool.com/rockhouse/uploads/files/88146278569.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/fabimusizivikupubagolide.pdfIn PDF document text
- https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gugukolukexi.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_off0000df5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF5F	11020 bytes
SHA-256: `839ce51d7a409d82d8bf4037967cc8a8dc6294e53507ef134ec24dd66a59948b`
`font_01_sfnt_off0000f8cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000110de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110DE	17752 bytes
SHA-256: `da74d146212656751b275d43ddc1b7a364a20aa49e6252869398d50659855efb`

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