PDF malware analysis — malicious · 4e43ab91a28f112d

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 11:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 4b04e80f7d9292e7b76dc3895d338ad4 SHA-1: cd9bf462314b20d15ef224c1440638da11fbedb3 SHA-256: 4e43ab91a28f112d08afd5f08ef8947e5e8ceff37ab63168fc315a287bc6cc1c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://szm.hu/userfiles/file/29344488785.pdf In PDF document text
- http://salt17.com/userfiles/files/lerokotebilax.pdfIn PDF document text
- http://gzperson.com/uploadfile/files/46185757285.pdfIn PDF document text
- https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wulisijojepavupe.pdfIn PDF document text
- http://digilit.ir/basefile/digilitir/files/pigesowidomotivajikixad.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/nulonixalo.pdfIn PDF document text
- http://jongauger.com/userfiles/file/83211642535.pdfIn PDF document text
- http://netmutum.com/userfiles/file/80339750974.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/vaxidizatajebe.pdfIn PDF document text
- https://jackinthegym.com/uploads/files/202109051901377303.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xelopove.pdfIn PDF document text
- http://comlark.ru/userfiles/files/49584420658.pdfIn PDF document text
- http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7619324295.pdfIn PDF document text
- http://studiodugnani.it/userfiles/files/golifapivor.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/5911478374.pdfIn PDF document text
- https://caraudioshop.ro/mm/file/foruporakep.pdfIn PDF document text
- http://capitaloffice.pl/fotki/file/58725366364.pdfIn PDF document text
- http://geerhannutpourreussir.be/docs/upload/files/zanemiket.pdfIn PDF document text
- http://tyextractor.com/d/files/55525297289.pdfIn PDF document text
- https://makojudo.pl/zdjecia/fck/file/pinefojajuvaruniwigaga.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/bufirisivu.pdfIn PDF document text
- https://memorybg.net/app/templates/js/ckfinder/userfiles/files/33142308.pdfIn PDF document text
- http://t-eamplus.de/web/editor/files/jivavup.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=justice+league+action+season+1+downloadPDF 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_off0000b53a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB53A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD4C	17160 bytes
SHA-256: `70377740e3cbe3c29f5438fd6797e8b9efd7cff456fba68b7b39afbc45d17852`
`font_02_sfnt_off0000f8a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8A0	10672 bytes
SHA-256: `40a0e977c89f94983e4f4a7fe514d0960b8b281a0d18369c87400cc8ad960734`

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