PDF malware analysis — malicious · 5c50b83c9c5cd142

MALICIOUS

PDF

108.0 KB Created: 2021-09-16 21:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0dd667374a49dbcac6b7f148d28d0787 SHA-1: 4d0c8c0007dbfeb9570b547ad2d9d35339e57d42 SHA-256: 5c50b83c9c5cd142525f2c7124d0b915da4393a31c31ab41b52bdd646a2daa38

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristics indicating its nature. The presence of embedded JavaScript and numerous external URLs, many hosted on potentially disposable domains, suggests an attempt to redirect users or download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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 http://esteel.my/userfiles/file/gibozunupabuvowaba.pdf In PDF document text
- https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/38038583074.pdfIn PDF document text
- http://cuathepvangohaiduong.com/images/ckeditor/files/pojopalekofagewi.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dbd594c09cf835ee7bd6677ec820f05c/wikije.pdfIn PDF document text
- http://abpaluso.com/upload/file/zobumisovugomojud.pdfIn PDF document text
- http://rtm-plus.ru/ckfinder/userfiles/files/3464643943.pdfIn PDF document text
- http://wwstationery.com/files/file/91054917135.pdfIn PDF document text
- https://adtw1.elfjane.com/ckfinder/userfiles/files/figoranobanomofuxat.pdfIn PDF document text
- http://mayjack.com/upload/files/kozigupebuja.pdfIn PDF document text
- http://shipsupply.ru/userfiles/files/53405168436.pdfIn PDF document text
- https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/xifutizopasaneveta.pdfIn PDF document text
- http://platypusspot.org/uploads/ckfinder/userfiles/files/83965647234.pdfIn PDF document text
- http://struttur-arch.it/userfiles/files/risakemunixawafefila.pdfIn PDF document text
- http://esoftland.com/userfiles/file/80665574272.pdfIn PDF document text
- http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/namugixodetisenu.pdfIn PDF document text
- http://msmzizkov.cz/data/dokumenty/fajilopebipavuwow.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/gelezosoremedobafozegenuf.pdfIn PDF document text
- https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/labeganebuxodisupibobusiz.pdfIn PDF document text
- http://aaz.sk/editor_uploads/files/36453432830.pdfIn PDF document text
- http://donkaew-furniture.com/ckfinder/userfiles/files/puzunanomemuxiwulu.pdfIn PDF document text
- http://oris-am.com/editor_up/raforuji.pdfIn PDF document text
- http://mengnuanua.com/app/webroot/files/files/fiforovi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fifty+shades+freed+free+to+watchPDF link annotation
- 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_off00013e31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E31	10600 bytes
SHA-256: `7f9062f8fc3046b4004e79ed3658857f418dbc469bfead9ac5799c3b3580862e`
`font_01_sfnt_off000156a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x156A1	19576 bytes
SHA-256: `1c63b1f90c593011726c81bc76951122289cb5adc9df84c748f21901ab4ef7b9`
`font_02_sfnt_off00018a57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18A57	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.