PDF malware analysis — malicious · 91051a39f1223a5d

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 6f44888d4b57553c91e94188496580a8 SHA-1: 38b77c32f311c209d2c7317ff21d07d2db354d06 SHA-256: 91051a39f1223a5d8cec4134328ff022eb5ba0c7628ee11c7dada8a149777496

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for downloading further payloads or redirecting 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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://archism.ru/uplcv?utm_term=email+tracker+android PDF link annotation
- https://e-casainteligenta.ro/userfiles/file/554382061.pdfIn PDF document text
- https://99shayari.in/userfiles/files/wisizasazomonorezijux.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1d417e63---81199244601.pdfIn PDF document text
- https://www.delaneyllc.com/ckfinder/userfiles/files/lijobiruxokiju.pdfIn PDF document text
- https://panegovernance.com/ourprojects/chowki/UserFiles/file/61972487577.pdfIn PDF document text
- https://kvzriu.org/images/file/jitofageverusexo.pdfIn PDF document text
- http://2222.netsociality.com/upload/files/54175110189.pdfIn PDF document text
- http://leadershipcareer.kr/fckeditor/_upload/file/zulufe.pdfIn PDF document text
- https://sacc-la-chaux-de-fonds.ch/fichiers/file/fidojogufojixewufuvetawaf.pdfIn PDF document text
- http://ayurveda-shiatsu-qigong-nice.com/upload/files/75810538174.pdfIn PDF document text
- http://www.prodomasa.com/ckfinder/userfiles/files/28759758409.pdfIn PDF document text
- http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/timapinamuxilem.pdfIn PDF document text
- https://hijaulumut.com/contents/files/28394424304.pdfIn PDF document text
- https://bitree.ru/ckfinder/userfiles/files/likigosazivelokaruwuvuwev.pdfIn PDF document text
- https://samngaimarble.com/html_upload/file/zonitudojekoxune.pdfIn PDF document text
- http://pinxedien.net/upload/files/xamasojedif.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/kulelotubuzujul.pdfIn PDF document text
- http://skkl.cn/filespath/files/20210906072155.pdfIn PDF document text
- http://work4shop.cz/userfiles/file/61030063317.pdfIn PDF document text
- http://clinical-pain.com/pds/userfiles/files/pofamodobomubevuletuvizoz.pdfIn PDF document text
- https://shevtsov-art.com/uploads/files/77988264124.pdfIn PDF document text
- http://ibrahimalsada.com/pics/file/gadesupazujox.pdfIn PDF document text
- http://medtravel.lv/images/hand_uploaded/files/17677647316.pdfIn PDF document text
- https://nuttydog.hu/ckfinder/userfiles/files/17698594746.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_off0000edb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105CC	10436 bytes
SHA-256: `b58b8fd26f9b602a9f774b8ec32eda5ff1b82d3716e799ef074072b4520123cd`
`font_02_sfnt_off00011d62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D62	18120 bytes
SHA-256: `85d3dcbf6e195b9a9ca636ad03beab7e878049a853053d8c30a66c106542be03`

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