PDF malware analysis — malicious · 82ad51bcc980dfe8

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 13:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 3560dcec063c087c66940f98edaacf3c SHA-1: 1e2eff610d2b025b4d968f1aff150246902f2aff SHA-256: 82ad51bcc980dfe8606cbe74c1438e55870657aa4e1469dcce9dad04029c7663

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely to redirect users or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=undisputed+4+full+movie+english+complete+2016 PDF link annotation
- https://www.hosotte.com/ckfinder/userfiles/files/76127756025.pdfIn PDF document text
- https://szelvedojavitasmiskolc.hu/files/files/lekazisaluresanemugitiz.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/duxenofizamir.pdfIn PDF document text
- http://shiny-baby.com/fileimage/file/31578898968.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-9-19/20210919184407815274.pdfIn PDF document text
- https://pasationtravellers.com/root/FCKeditor/file/bazigatuwogidedo.pdfIn PDF document text
- http://museodegliarazzimarsala.com/userfiles/files/29043758130.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/61294032111.pdfIn PDF document text
- http://kmbb.at/userfiles/file/lemeranotoxaxenuv.pdfIn PDF document text
- http://dui-antidote.net/images/userfiles/file/sapixafubi.pdfIn PDF document text
- https://xtrafitcoaching.com/www/images/files/92918313184.pdfIn PDF document text
- http://megat.pl/uploaded/fck_files/file/xumopu.pdfIn PDF document text
- http://mannadey.in/FCKeditor/file/67897067513.pdfIn PDF document text
- https://vresponse.net/userfiles/file/jexopetel.pdfIn PDF document text
- https://pakianco.ir/data/image/uploads/news/files/30391506905.pdfIn PDF document text
- http://synagoge-stommeln.de/ckfinder/userfiles/files/kodasonag.pdfIn PDF document text
- https://sinarlangit1.com/contents/files/fuxonafufakef.pdfIn PDF document text
- https://saleskerala.com/ckfinder/userfiles/files/87233271819.pdfIn PDF document text
- http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/91906995480.pdfIn PDF document text
- http://ahzycw.com/upload_fck/file/2021-9-25/20210925143022584642.pdfIn PDF document text
- https://helices-evra.com/userfiles/file/mulesu.pdfIn PDF document text
- http://dreamsurgerycn.com/ckupload/files/jejodifidif.pdfIn PDF document text
- http://ng-sons.com/userfiles/file/katupikuri.pdfIn PDF document text
- http://nanouklid.cz/upload/file/wijaziwejoloto.pdfIn PDF document text
- https://nmg.lv/img/uploads/files/zefenubobirej.pdfIn PDF document text
- http://jgbt.us/pds/userfiles/files/rawevinadif.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_off0000b125.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB125	11520 bytes
SHA-256: `1e60f689787920a952a7561e5b13311b827fcd084dce4d84226a11acb4cfbde3`
`font_01_sfnt_off0000cc24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC24	16564 bytes
SHA-256: `7cae8d11e9b97c7f407335263ceeba314fb3c9ced5ac091e8f79ba666b760c4b`
`font_02_sfnt_off0000f671.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF671	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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