PDF malware analysis — malicious · cdab6b2e0788467c

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 21:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7835ec2ebf57bdebfaa480d4547824e8 SHA-1: 3e2286cbe80d8a0cb9851f07e2ad971f9f1cb850 SHA-256: cdab6b2e0788467c689837f37775987388354269ca3dea6037b5d8c88e991ee1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a multi-stage redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://bomando.bomsolar.com/uploadfiles/files/varikarure.pdf In PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/vutefifetufar.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vonm4okv6fbj81887n3er2c2h2/jinujove.pdfIn PDF document text
- http://carscaso.com/js/upload/files/52368827587.pdfIn PDF document text
- https://internationalmedia.com/userfiles/file/jeloxebir.pdfIn PDF document text
- https://projekt-lesen.de/userfiles/file/jovulazelelijipime.pdfIn PDF document text
- http://biomehl.com/images/content/files/75698111004.pdfIn PDF document text
- http://siamsnail.com/media/userfiles/files/84586908609.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/11231103633.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f094b99563---benakeworijoxudulewotof.pdfIn PDF document text
- https://jnvhardoi.org/ckfinder/userfiles/files/67717317827.pdfIn PDF document text
- http://martonelektro.hu/files/file/37533914775.pdfIn PDF document text
- http://montazenabytkupraha.cz/files/file/gujijadirefotajo.pdfIn PDF document text
- http://esenkardeslerinsaat.com/resimlerfiles/95941279922.pdfIn PDF document text
- http://ridendo.cz/files/file/lozisajiniwumelojunix.pdfIn PDF document text
- https://nazragame.com/calisma2/files/uploads/mikomobeziwitowuno.pdfIn PDF document text
- https://funcarele.com/ckfinder/userfiles/files/7345509279.pdfIn PDF document text
- http://mathcountsoutreach.org/userfiles/file/xalumojej.pdfIn PDF document text
- http://francescofesta.it/userfiles/files/mamakata.pdfIn PDF document text
- http://danies.ru/ckfinder/userfiles/files/susexuvufabubigake.pdfIn PDF document text
- http://kiemdinhcan.com/Images_upload/files/podukobegeju.pdfIn PDF document text
- http://technoauto.jp/js/upload/files/jisugerixile.pdfIn PDF document text
- http://wohntraumgmbh.at/gitiw.pdfIn PDF document text
- http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/pijobumijeruneta.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+layout+a+letter+envelopePDF 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_off0000ceba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEBA	10340 bytes
SHA-256: `cb3127705fe7370545a749bd97bd9d394856742683e1a6132c35af291e9850b8`
`font_01_sfnt_off0000e63e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE63E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fe50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE50	17012 bytes
SHA-256: `71c2d258bea9c5558a9deca551a083ebc1b2797e55d660f9e8729122f00c7176`

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