PDF malware analysis — malicious · 623cc0ab4aa1df86

MALICIOUS

PDF

78.0 KB Created: 2021-09-26 16:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4d18a57064e98401a4c923f5b8a383bc SHA-1: e50e5bb60a867ec3a4c3cb538573c1b1c75ab6ff SHA-256: 623cc0ab4aa1df861de04707edc6d0a46e2f1df6416b15d1f59378b089a7a61c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs pointing to various domains, many of which are likely part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=cursive+alphabets+capital+and+small+letters+worksheet+pdf PDF link annotation
- http://dainichiji.com/upload_ckr/files/vojavalaroruzekixufosinow.pdfIn PDF document text
- http://alrabbancapital.com/file/files/tagogofugugasewopinexo.pdfIn PDF document text
- https://simorgh.it/uploads/file/44374053490.pdfIn PDF document text
- https://comptables-publics.fr/userfiles/file/piritomafazugubi.pdfIn PDF document text
- http://strategie-online.net/catalogue_dynamique/file/13762234868.pdfIn PDF document text
- http://altera.ukrstroyka.com/content/xuploadimages/file/lawopikolobifajezep.pdfIn PDF document text
- https://batdongsandothanh.vn/luutru/files/dafazupes.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/78008778581.pdfIn PDF document text
- http://cheniou.handysociality.com/upload/files/dumoburelitifezu.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/331b59a435c69d5f4f487b1df2197a27/pusodazavinavefibubuxirap.pdfIn PDF document text
- http://waetsukai.jp/system/ckfinder/userfiles/files/kasekozavelenuxep.pdfIn PDF document text
- http://sun-dr.com/uploads/files/202109260453275393.pdfIn PDF document text
- https://gastrotest.co/ckfinder/userfiles/files/68043002518.pdfIn PDF document text
- https://solturism.ro/images/file/tupovudetasipalijak.pdfIn PDF document text
- http://w3-japan.com/js/upload/files/44712090841.pdfIn PDF document text
- https://carolinevlieghe.fr/images/file/fofasonafik.pdfIn PDF document text
- http://angarakshaksecurity.com/userfiles/file/wasedazixotudigubisejaxal.pdfIn PDF document text
- http://topp.pl/_topp/file/63950161142.pdfIn PDF document text
- http://polishingmarblefloor.it/userfiles/files/76130601833.pdfIn PDF document text
- http://jts-electrical.co.uk/ckfinder/userfiles/files/86209140479.pdfIn PDF document text
- http://www.petersonassoc.com/emailimages/file/sefolitunedotaxunivemov.pdfIn PDF document text
- http://ukrkarta.ua/fckeditor/userfiles/file/zubikimebiribesukego.pdfIn PDF document text
- http://tznjl.com/userfiles/files/linerubunuxija.pdfIn PDF document text
- https://www.paseppe.gr/ckfinder/userfiles/files/gakikilovujef.pdfIn PDF document text
- http://vrajacreation.com/uploaded_files/userfiles/files/tomugavum.pdfIn PDF document text
- 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_off0000c49e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC49E	19464 bytes
SHA-256: `56598b32cffcfaf2c81370cac05e9d88cad82bd343e3841f949b57e0f20c7f6f`
`font_01_sfnt_off0000f6bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ED3	11400 bytes
SHA-256: `200e7fbf96e2f605745e4129568cd0130d7fd7fb6b79fb05abad0572b7fd11d1`

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