PDF malware analysis — malicious · 819ba2376ea15141

MALICIOUS

PDF

88.8 KB Created: 2021-09-23 04:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 113d27582e3c534d56da18c7a50fcd20 SHA-1: 2b9fefedf8a13cfe498d4aa142e62b5d7370bd90 SHA-256: 819ba2376ea15141b6fc1708bf58df847e21cb1d7946794edad64b011647aeb5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document attempts to trick the user into installing remote support tools, which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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
Remote-support tool lure high SE_REMOTE_SUPPORT_LURE

Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
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.
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://chcial.ru/uplcv?utm_term=app+viewer+apk PDF link annotation
- http://ekbdrive.ru/ckfinder/userfiles/files/busarobivewokijikejug.pdfIn PDF document text
- http://union-montage.pl/userfiles/file/70199612110.pdfIn PDF document text
- http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/47239311043.pdfIn PDF document text
- http://ncdesign.it/userfiles/files/78878173288.pdfIn PDF document text
- https://lifecareproduct.in/ckfinder/userfiles/files/82427410903.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/telun.pdfIn PDF document text
- https://thietbidiensino.vn/media/ftp/file/39828494687.pdfIn PDF document text
- https://altsovmun.ru/userfiles/file/16911541810.pdfIn PDF document text
- http://fzsvybbs.at/userfiles/file/71047389165.pdfIn PDF document text
- http://virtualcharityevents.com/vce_cake/files/files/jaresixido.pdfIn PDF document text
- https://krygina40.ru/UserFiles/File/33002474710.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1ef9872b27ae8f08c3b93cd344777cdb/18031699473.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/94107215548.pdfIn PDF document text
- http://stroyvodservice.ru/upload/File/gataxegorivumupapokidab.pdfIn PDF document text
- http://sky1981.com/asset/uploads/files/xuxewikadolefale.pdfIn PDF document text
- http://museodegliarazzimarsala.com/userfiles/files/99184607944.pdfIn PDF document text
- http://zezoalza.com/ckupload/files/67129019305.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ui91eivnlk8o7p98dae3e8jtkb/fedugak.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/83012122937.pdfIn PDF document text
- http://archive-2013.humandoc.pl/attachments/file/febiziripa.pdfIn PDF document text
- https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/lofozoduvomuzozibokux.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.comIn 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_off0000fbe7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBE7	17744 bytes
SHA-256: `74039d61b799c47e6c79223b19d0ed3f858e56018cd391493bfc476cb15dff1a`
`font_01_sfnt_off00012a71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A71	9932 bytes
SHA-256: `f426b96f95bf0d4c8295e3031abf835d8d915f1da7cda3c6d40a2fba3005c569`
`font_02_sfnt_off00014094.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14094	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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