PDF malware analysis — malicious · 6940d9b06daf2104

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 21:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4a6bae34f46348b1caa17ed1d719d4cd SHA-1: f3c024f0ab17f5a7685522046bad3b3baf47e1e0 SHA-256: 6940d9b06daf21040957f8aa5b8b80c1db2c0a333b6c5eec1b102b6a9e6bbd73

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests an attempt to download and execute a secondary payload or redirect the user to a phishing site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a phishing or spamming campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://ruh-center.ru/userfiles/file/97471170628.pdf In PDF document text
- https://wilocom.ro/ckfinder/userfiles/files/riforipudoxupujo.pdfIn PDF document text
- https://groupekheidri.com/ckfinder/userfiles/files/77563473469.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/pexetuk.pdfIn PDF document text
- http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tisejonetenoxo.pdfIn PDF document text
- http://technology-mp.it/userfiles/files/74972515744.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1631792726.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/82206285080.pdfIn PDF document text
- http://dulwichtaxi.com/survey/userfiles/files/vujone.pdfIn PDF document text
- http://hugslock.com/app/webroot/img/files/42046442757.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1d7ei420n5jtjo3cr8pccdsn85/pinesukijizujejejafix.pdfIn PDF document text
- http://fotofolliasanlazzaro.it/userfiles/files/tesaradurumalavibifaved.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131141ccb29a---85383433445.pdfIn PDF document text
- http://eatatrudy.com/uploads/files/47984710826.pdfIn PDF document text
- https://contact-house.com/fckeditor/upload/file/81442199520.pdfIn PDF document text
- http://efuegypt.org/userfiles/file/ninatumotasovubosoluk.pdfIn PDF document text
- http://sartoriaventurini.com/userfiles/files/33846947848.pdfIn PDF document text
- http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/fugosajakamozediwor.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/35380784124.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/paxuwufiguwanumij.pdfIn PDF document text
- http://unewstoday.com/task/userimages/file/33112546299.pdfIn PDF document text
- http://studiospazioambiente.it/userfiles/files/torar.pdfIn PDF document text
- https://kocarbonag.com/luutru/files/44209513122.pdfIn PDF document text
- https://ijmscr.com/ckfinder/userfiles/files/luwinawoba.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+range+of+the+sine+function+isPDF 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_off0000c3c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD7	10632 bytes
SHA-256: `b23a849ce33ef9aa539014a84eb546bdfbccbb9e2daed547c3b5975b962491c2`
`font_02_sfnt_off0000f42c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42C	17900 bytes
SHA-256: `d452d9370c573c80216327d36744f3e1e582e4e453c48b0464015769f9a09d4f`

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