PDF malware analysis — malicious · 4a015258ad55636b

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 15:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ddc119db3e06a45d24d00dace5151092 SHA-1: e17b7c12579f3b5b2e54983439ad4fdeb4efa7cd SHA-256: 4a015258ad55636bf6b682052ab725b1a833d529a7f0a408ed8878227ee07fbc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or link-farming scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

Heuristics 5

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.
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://philabc.ru/uplcv?utm_term=treble+clef+notes+lines+and+spaces PDF link annotation
- https://floridainvestment.cz/files/file/18854963384.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec9fba0a4f---lufajejubenokara.pdfIn PDF document text
- http://www.frank-diagn.hu/userfiles/files/powobasaba.pdfIn PDF document text
- https://novamakine.com/upload/ckfinder/files/90995960700.pdfIn PDF document text
- https://tranduongauto.com/app/webroot/files/images/pages/files/61469921920.pdfIn PDF document text
- https://zahrek.com/userfiles/file/57728501671.pdfIn PDF document text
- http://j1medical.com/uploaded/file/zofisewix.pdfIn PDF document text
- http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/dagasedusiwerideze.pdfIn PDF document text
- http://korea-seals.com/ckfinder/userfiles/files/gabobapo.pdfIn PDF document text
- https://komunalno.vrgorac.hr/files/64388386310.pdfIn PDF document text
- http://bosch-elektronarzedzia.pl/catalog/file/97980259173.pdfIn PDF document text
- https://hbfilm.ca/resimler/files/57168795311.pdfIn PDF document text
- https://isosklo.cz/uploads/towesumumum.pdfIn PDF document text
- http://templeton.sk/userfiles/file/57882070902.pdfIn PDF document text
- http://clingac.com/d/files/21150912877.pdfIn PDF document text
- http://silver1979.com/upload/file/53532471775.pdfIn PDF document text
- http://centrons.com/uploaded/file/14033920436157abdedef74.pdfIn PDF document text
- http://quincy.pl/ckfinder/userfiles/files/nifav.pdfIn PDF document text
- http://fluitec.fr/ressource/site-image/files/83102456218.pdfIn PDF document text
- http://surtek.biz/image/files/20150324_023406.pdfIn PDF document text
- https://beeshark.ro/app/webroot/files/userfiles/files/duvater.pdfIn PDF document text
- https://ifbscalidad.eus/files/galeria/files/mujuf.pdfIn PDF document text
- http://2222.netsociality.com/upload/files/savolunetutej.pdfIn PDF document text
- https://tauthuy.vn/upload/files/77570482673.pdfIn PDF document text
- https://komunalno-vrgorac.hr/files/95110403278.pdfIn PDF document text
- http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/95518624701.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_off0000b58f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB58F	10716 bytes
SHA-256: `073642c8192d88fab32af25ab88a7168e0b1630418e3af6b7d533fcbe36541fa`
`font_01_sfnt_off0000ce09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE09	16188 bytes
SHA-256: `12b06d13aaceb4c3f4860e2032a9e5493bab341920f8c36e20e4cea0217b654d`
`font_02_sfnt_off0000f6fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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