PDF malware analysis — malicious · ffd0642ce2448402

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 06:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 381445ae5db88b6a36e5ab79b3aad345 SHA-1: 824cbe514c906a13bf6634ff8b28058a0ca46982 SHA-256: ffd0642ce2448402346b2b45c97104e903270a37d926750008b74802a9c06a76

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://khangvietdn.com/uploads/file/lovidudoz.pdf In PDF document text
- https://haisanquangninh.org/data/dulieu/files/37948727983.pdfIn PDF document text
- http://romento.com/uploaded_files/userfiles/files/25344822135.pdfIn PDF document text
- http://burchiellati.com/file_fck/file/40018265838.pdfIn PDF document text
- http://rebeccafantarchitetto.it/userfiles/files/47289898215.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9daf2ff5ffeed8d6e6fd1957f77d2a8c/25976976107.pdfIn PDF document text
- https://rent-1.es/ckfinder/userfiles/files/zemitifesafi.pdfIn PDF document text
- https://polymadeniyaglar.com/fckeditor/userfiles/file/90771238959.pdfIn PDF document text
- https://santa.sg/images/users/00000000/files/50369059344.pdfIn PDF document text
- https://medicabg.com/uploads/wysiwyg/files/35452120741.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/76080656644.pdfIn PDF document text
- http://clinicaveterinariasangiacomo.it/userfiles/files/11755518474.pdfIn PDF document text
- http://nilesk.com/userfiles/file/36013010571.pdfIn PDF document text
- http://thesciencenetwork.org/uploads/files/92429219923.pdfIn PDF document text
- http://ranjoysarkar.in/FCKeditor/file/xosukorozifeponumaxa.pdfIn PDF document text
- http://changwontour.kr/FileData/ckfinder/files/20210921_3EEFF33E5674559C.pdfIn PDF document text
- http://www.vljainandco.com/userfiles/files/58510137664.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401e08f3240---pijugamono.pdfIn PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109071423003544.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/sajokodudukuzipurabizopox.pdfIn PDF document text
- http://flairpens.ru/uploads/files/96348220424.pdfIn PDF document text
- https://aldaserwis.pl/ckfinder/userfiles/files/nozepo.pdfIn PDF document text
- https://yoimart.com/upload/file/20210902142433.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+world%27s+largest+country+by+areaPDF 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_off0000b140.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB140	16220 bytes
SHA-256: `4f93cfb1fe33d77cec227ccc2f7e470c276b45c23fb4be3d4dd942d57300a064`
`font_01_sfnt_off0000da65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA65	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f27c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF27C	11116 bytes
SHA-256: `51892b5b5dce152879fada978f18ae1e76e6dec02cb64f851584807b33a60664`

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