PDF malware analysis — malicious · d41ec5c49ce1449b

MALICIOUS

PDF

81.1 KB Created: 2021-10-06 23:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 250895c4205e2ee126aa6ca39235921a SHA-1: 584fecc40e6f4530b91af67fab50e4425571e71e SHA-256: d41ec5c49ce1449bd57c43a1c6ff2b76d51953f86f4ffc39d80f78caa56d92bd

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs pointing to various domains, suggesting a phishing or SEO manipulation scheme. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

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
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://zhengfutz.com/v15/Upload/file/202191422495340.pdf In PDF document text
- https://educationindiajournal.org/ckfinder/userfiles/files/60095924209.pdfIn PDF document text
- https://elsadaulte.com/ckfinder/userfiles/files/zavenoxawixudev.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0cceaf86b143772fdd7b00e0b418d244/16815273476.pdfIn PDF document text
- https://kaparatt.com/images/File/verafowomutesosavomit.pdfIn PDF document text
- http://shesob.com/file/files/rigojusoze.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e725f6a42a---97967268554.pdfIn PDF document text
- http://dobrasekacka.cz/userfiles/file/9802586727.pdfIn PDF document text
- https://karolinanowak.com/userfiles/file/37463038288.pdfIn PDF document text
- http://modaxch.com/userfiles/files/74971502081.pdfIn PDF document text
- https://soechi.net/userfiles/file/94028498425.pdfIn PDF document text
- http://mottaing.eu/userfiles/files/67406640772.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/79378063862.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/21677244673.pdfIn PDF document text
- http://1night2daytour.com/ckupload/files/wiwiwe.pdfIn PDF document text
- http://halongwave.com/userfiles/file/11334860394.pdfIn PDF document text
- https://lawtutors.co.uk/js/ckfinder/userfiles/files/nikujelapu.pdfIn PDF document text
- http://uspeh-kursk.ru/ckfinder/userfiles/files/norazere.pdfIn PDF document text
- http://fotografiafrancescosomma.com/userfiles/files/39310129634.pdfIn PDF document text
- http://canoeing.by/pics/files/dejopiragirinuwig.pdfIn PDF document text
- http://thomas-zigon.de/images/file/52801460745.pdfIn PDF document text
- https://everywheregenes.com/uploadfile/qu26_qu106_com/files/retuwudajekuvikebux.pdfIn PDF document text
- https://hanyauntuktesting.com/contents/files/xibarixenekuletorukokaso.pdfIn PDF document text
- http://antwerp-reefer-tournament.be/argt/files/83842304771.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=size+13+foot+lengthPDF 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_off0000d90b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD90B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f11d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF11D	17920 bytes
SHA-256: `72f7172a6790653ce71e7d9aa9876fee81f4bcb39e75ed966872592d45867f42`
`font_02_sfnt_off00011f79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F79	10420 bytes
SHA-256: `4920ca25f2b49370e32a9333756c93c8d06184d008fce03dde4c9470664cafb9`

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