PDF malware analysis — malicious · b5530ba608937674

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 02:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2f3b88475d8d1371b9da241dfa07dacf SHA-1: 3d45726b14a77793944f336c9e5c6d8f5cf84786 SHA-256: b5530ba608937674f265dd026c0ea4475039aa094d5752e59665ced71af300d1

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. The PDF also contains a large number of external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=jerry+and+tom+movie+2021 PDF link annotation
- https://mtmnetwork.net/uploadEditor/files/61909141664.pdfIn PDF document text
- https://ssekolkata.com/ckfinder/userfiles/files/nojixepatozovolixunumo.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/44088491400.pdfIn PDF document text
- http://gzsjlt.cn/userfiles/file/rumapajulufasovuzorovorim.pdfIn PDF document text
- http://robwalker.net/fckupload/file/60646323977.pdfIn PDF document text
- http://ylpqzl.com/ckfinder/userfiles/files/mowirowijedubuf.pdfIn PDF document text
- http://tehpromyar.ru/media/file/xerawojawowiramajada.pdfIn PDF document text
- http://mhinflatable.com/upload/file/61989415515.pdfIn PDF document text
- https://avistravel.ro/userfiles/file/vimuxaxemomo.pdfIn PDF document text
- http://tccsrl.org/userfiles/files/30952204054.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370867b39cd---58172775084.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/fuditeme.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/39421831731.pdfIn PDF document text
- https://southwestlooms.com/admin/userfiles/files/gixop.pdfIn PDF document text
- http://www.web-globus.de/ckfinder/userfiles/files/nabofoviz.pdfIn PDF document text
- http://silverspringabw.com/uploads/files/rupetadutosipiroxiwopa.pdfIn PDF document text
- https://fasaac.org/temp/files/36052099558.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/durugavimevev.pdfIn PDF document text
- http://autoscuolepintozzi.it/userfiles/files/57862934007.pdfIn PDF document text
- http://frchem.cn/upload/files/44884953530.pdfIn PDF document text
- http://csc0535.com/userfiles/file/20210913170156_xoibyh.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/wawulokilazarezevuwibise.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133973899eb5---xekikapetegujafusaguwud.pdfIn PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/dumajuzurupexafimi.pdfIn PDF document text
- http://sangtaoad.com/uploads/userfiles/file/17097022044.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_off0000e5dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5DC	10660 bytes
SHA-256: `2794fe9602228e3ddfd480e7f2965c09f372f39c86045dab7ffcd371955a4b7a`
`font_01_sfnt_off0000fe63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE63	18388 bytes
SHA-256: `5d669c2b613122811f14caebbec07c585a12ab50de8ea559bba634be797f014a`
`font_02_sfnt_off00012eb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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