PDF malware analysis — malicious · be6567111259b48d

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5711982e05ba6f9b926d929a8f859ea3 SHA-1: cad4acf696141b86b9de0bd35c27e2e7e9389caa SHA-256: be6567111259b48d39fe3863c1c9e2733571d254a3fb8522998a3da45b60d61d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically identified as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or scam attempt to direct users to malicious content. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://rm-parketi.si/uploads/nerumifilixivurepereno.pdf In PDF document text
- http://palyavalaszto.hu/teszt/upload/file/gexikifusesilinef.pdfIn PDF document text
- http://a-pluset.com/userfiles/38055091784.pdfIn PDF document text
- http://huijingweb.com/upload_fck/file/2021-9-10/20210910005618873275.pdfIn PDF document text
- http://clinical-pain.com/pds/userfiles/files/24848421371.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/24712958030.pdfIn PDF document text
- https://tivirtual.com/userfiles/file/wunofemufik.pdfIn PDF document text
- http://maketmaster.ru/admin/ckfinder/userfiles/files/1430253569.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/84318196244.pdfIn PDF document text
- http://w-f-l.de/user_img/file/jatibekos.pdfIn PDF document text
- http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e31c21efb455ac0e35153ccf43c92a8e/4054452837.pdfIn PDF document text
- https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vilivulof.pdfIn PDF document text
- http://neonatal-surgery.ru/userfiles/files/78072888623.pdfIn PDF document text
- http://thy-environment.com/userfiles/files/74237280266.pdfIn PDF document text
- http://puntolinea.org/userfiles/files/betamumele.pdfIn PDF document text
- http://di-tech.kr/fckeditor/userfiles/file/bidilefoxox.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/xejawas.pdfIn PDF document text
- http://tucholainfo.pl/userfiles/file/8634795990.pdfIn PDF document text
- https://tcremich.lu/files/files/xozomuda.pdfIn PDF document text
- https://hideab.se/tc/Mediagalleri/file/74000348232.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+emerald+hacked+romPDF 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_off0000ccb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCB3	18336 bytes
SHA-256: `b6661e3cb1bff4b5be57cd5154e1caf12560499a973d4a10bfeec922b5677359`
`font_01_sfnt_off0000fce1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000114f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114F8	10372 bytes
SHA-256: `c7a7358bc2fd7c19551f7a812918a5958899b12eacce97732ddc9ecfa249599a`

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