PDF malware analysis — malicious · d5721dea3c94296c

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 06:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 02ac3b0c373a14baeab870d002e963fb SHA-1: 73258d0d29a407b889525fc41bba67ac63e40ae3 SHA-256: d5721dea3c94296c254d4d5e577ea8d5fdaaca8a50f8b2999e74f68eeea10bf1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or link-farming scheme. Although no scripts were explicitly detailed, the 'PDF_JS' heuristic indicates the presence of JavaScript, which could be used to obfuscate malicious links or redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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://svb-volleyball.de/userfiles/file/13550655316.pdf In PDF document text
- https://ferado.vn/userfiles/file/jiruw.pdfIn PDF document text
- https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdfIn PDF document text
- http://guides2alpes.fr/uploads/file/ditufutipanesadepisupula.pdfIn PDF document text
- http://demenagements-remond.fr/userfiles/file/20210907221102.pdfIn PDF document text
- http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
- http://goldenstarhotel.vn/images/uploads/files/wotiboxi.pdfIn PDF document text
- http://indyztyle.com/ckfinder/userfiles/files/5869918683.pdfIn PDF document text
- http://asbazainville.org/userfiles/file/rifetujugapuzerapumebal.pdfIn PDF document text
- https://vanphongphamhienluong.com/upload/files/pakubatiwonavalapopow.pdfIn PDF document text
- https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/32374435316.pdfIn PDF document text
- http://santiagoporter.com/js/ckfinder/core/connector/php/files/63184668481.pdfIn PDF document text
- https://www.comperat-89.fr/ckfinder/userfiles/files/53675468296.pdfIn PDF document text
- http://tandartsindex.nl/images/uploads/buxekefuvavuvadibor.pdfIn PDF document text
- http://rasciindia.com/firetech/ckupload/files/85662691836.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/putre6l3kr91nsfq4iiqd0sl8n/81589309751.pdfIn PDF document text
- http://lianbang123.com/uploads/files/202109090559493108.pdfIn PDF document text
- http://casaledellasignora.it/userfiles/files/sagori.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/10986950203.pdfIn PDF document text
- https://khambenhxahoi115.com/images/files/45175362584.pdfIn PDF document text
- http://mopron.ru/upload/files/nejewes.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e4a38c31---wesebenudoxu.pdfIn PDF document text
- https://horkolas-gatlas.hu/ufiles/file/26152357282.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ing+home+bank+aplicatie+androidPDF 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_off0000d30c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD30C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB23	10976 bytes
SHA-256: `a3d913274874ce1a6b8592ae569f9ccc59a37d8402f780ca5d3253382da48184`
`font_02_sfnt_off000103eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103EB	16604 bytes
SHA-256: `a0a881a0f9fd505f6afd14a04646114f30b2835571729c662f31f46e535fe615`

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