PDF malware analysis — malicious · 162e03f043f16102

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 04:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 792392515028a53e9b4c6c1f59ec3371 SHA-1: 79f4c90f673e86d3e75260720a33166c0cdc5c15 SHA-256: 162e03f043f161024ed55cb760daf726221a19fd1be528bd11e1aab8a5433bf6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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, many pointing to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The embedded JavaScript likely facilitates this redirection or further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://lmnn.ru/userfiles/file/66330607975.pdf In PDF document text
- https://www.zolmedis.lt/ckfinder/userfiles/files/diwijodu.pdfIn PDF document text
- http://grafichesirio.com/userfiles/files/69266501815.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/86195934389.pdfIn PDF document text
- http://libron.pl/fckupload/assets/file/11458012009.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a67dc265---xapugoni.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/mevul.pdfIn PDF document text
- https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/nodisifonodafawafekuz.pdfIn PDF document text
- http://mfcpavpos.ru/file/55038177792.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/ridiwawi.pdfIn PDF document text
- https://isleo.com/i_photos/file/sekowosanepumonofamekile.pdfIn PDF document text
- https://paulogomeslda.com/userfiles/file/liteposapup.pdfIn PDF document text
- https://ambalatender.com/upload/files/35736992493.pdfIn PDF document text
- https://bibonatura.com/ckfinder/userfiles/files/xunedojokuliralosufifo.pdfIn PDF document text
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/kukokedosopigotanobori.pdfIn PDF document text
- https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/wodewelivajegu.pdfIn PDF document text
- http://hitmet.slektenkaas.com/bilder/file/57460927005.pdfIn PDF document text
- https://alistairmills.com/ckfinder/userfiles/files/51338453823.pdfIn PDF document text
- http://autosklo.sk/pictures/file/27888681328.pdfIn PDF document text
- http://hantechwelding.com/userfiles/file/2021090716442673499.pdfIn PDF document text
- http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4627608bf26553d1e4c4dd9a8d361582/tezatosipusuweradaxibofa.pdfIn PDF document text
- https://ooobelkom.ru/ckfinder/userfiles/files/70460186585.pdfIn PDF document text
- https://luckysurface.itweald.com/uploads/files/61333d64d2c60.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=push+strategy+and+pull+strategyPDF 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_off0000f85b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011072.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11072	10676 bytes
SHA-256: `a8c588a10b4a8b61af058e94f76c9ca5a84363ae7b61ad88887191d25007bb79`
`font_02_sfnt_off000128ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128BA	18344 bytes
SHA-256: `b01a45461fb8bf08604e8d691ba7605f28075c7fc4ebeecf3c2f60fda4baba01`

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