PDF malware analysis — malicious · b11af714f65a0bc2

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 02:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ac082a69b96f29b551c3f34adcff8e34 SHA-1: 1808a18f3bf474f184b98f93d77f413d8f4a12b6 SHA-256: b11af714f65a0bc22a93f09f723404a5cf62576f083efc46bc8401e09221e7c5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use for executing malicious actions within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/uplcv?utm_term=god+of+war+damon+ps2 PDF link annotation
- https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/5058452308.pdfIn PDF document text
- http://tv-sat.cz/userfiles/file/gidofagewowopo.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/97598435293.pdfIn PDF document text
- http://gaishachuukobuhin.com/js/upload/files/10502989466.pdfIn PDF document text
- http://chanakol.com/ckfinder/userfiles/files/97189494136.pdfIn PDF document text
- https://equalland.com/uploads/File/zimovabozuviwes.pdfIn PDF document text
- https://dragonexpressml.com/userfiles/files/75308798292.pdfIn PDF document text
- https://bazab.ru/ckfinder/userfiles/files/12942509399.pdfIn PDF document text
- http://www.bufolari.com/public/immagini/file/mepofubujokejile.pdfIn PDF document text
- http://princeworldwide.com/multimedia/userfiles/file/wagivukuba.pdfIn PDF document text
- http://mdtrend.hu/files/file/9969094514.pdfIn PDF document text
- https://airxps.com/userfiles/files/75857872052.pdfIn PDF document text
- https://nhaccugiare24h.com/uploads/userfiles/file/xedoleritokatasib.pdfIn PDF document text
- http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/31540058793.pdfIn PDF document text
- http://servicedental.it/userfiles/files/rotapopetuvapusijufukuv.pdfIn PDF document text
- http://cgmorenanews.com.br/ckfinder/userfiles/files/4652372283.pdfIn PDF document text
- http://ore-processing.ru/d/files/77709103358.pdfIn PDF document text
- http://viettelhaiphong.me/data/dulieu/files/80410880308.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-08/210908014241730670rsh5au7cmjd5.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/telimupubuxazufuta.pdfIn PDF document text
- http://life-homeshop.com/asset/uploads/files/babemedafulofuw.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa836f71e---47351989091.pdfIn PDF document text
- http://www.novosib-sport.ru/ckfinder/userfiles/files/kivababiguxiparakito.pdfIn PDF document text
- https://brillimet.com/uploads/files/202109032059072088.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_off0000cfcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFCB	19040 bytes
SHA-256: `5a7af92bb4814b8d0ef0b4be4c54af638404830ad12514efec8479b6ab508c91`
`font_01_sfnt_off0001016e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1016E	10536 bytes
SHA-256: `b9a3a2a1699bf39e8d116dde87674686febe3d4a5535a3fd76392483913f8faf`
`font_02_sfnt_off0001198a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1198A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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