PDF malware analysis — malicious · e22cbcbf63c8365d

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 09:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 94d8330adf4cd1bc5e58b7f517f34789 SHA-1: 3f08cef787b7baa01255ace41ebd6975ccb74910 SHA-256: e22cbcbf63c8365d660fa450e8a65a2d5fb958ecad4b132a97f223e818c658af

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads across multiple sites. The presence of JavaScript indicates an intent to execute code, likely to download and execute further malicious content or redirect the user.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://rilta.net/userfiles/files/88132237393.pdf In PDF document text
- https://diagoldjewels.com/userfiles/file/7975265248.pdfIn PDF document text
- http://ckrestaurantgroup.com/ckfinder/userfiles/files/74538418388.pdfIn PDF document text
- http://euro520.net/userfiles/file/16329940271770913160.pdfIn PDF document text
- http://groupementpecheduloir.com/ckfinder/userfiles/files/3259377121.pdfIn PDF document text
- https://cqhuaan.myhost360.cn/upload/files/09-27-05-21-14-66.pdfIn PDF document text
- http://aptekainternetowa.net/_mdm_apteki/file/49939199698.pdfIn PDF document text
- https://dintek.eu/uploads/file/77414149461.pdfIn PDF document text
- http://jyy.jp/ckfinder/userfiles/files/20210921_085540.pdfIn PDF document text
- https://zagi.hr/files/monobisopovoji.pdfIn PDF document text
- http://lapempi.nl/ckfinder/userfiles/files/maden.pdfIn PDF document text
- https://baglab.pl/galeria/file/56881879241.pdfIn PDF document text
- https://sokole-tps.pl/userfiles/file/vugunofopogisaf.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/ragatewabudebalev.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/kixokogejak.pdfIn PDF document text
- http://www.centralperdana.com/file/jurenutu.pdfIn PDF document text
- https://ofcourselc.com/admin/uploadsfile/33970768299.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/84808426651.pdfIn PDF document text
- http://due.pt/js/ckfinder/userfiles/files/puvunulejokamamejuw.pdfIn PDF document text
- https://lawtutors.co.uk/js/ckfinder/userfiles/files/94981939787.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/kaxivufepemo.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161568b28f0b6d---58463436655.pdfIn PDF document text
- http://permagnet.com/upload_files/file/210929090107351757gfjekm.pdfIn PDF document text
- https://redengewinnt.com/userfiles/file/xoririne.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=who+said+that+quiz+questions+and+answersPDF 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_off0000b2e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cafd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAFD	10684 bytes
SHA-256: `5d729472c5816e9e1184b9fcb87e3cc68815b84f3c47b43e25afe2fc2d701190`
`font_02_sfnt_off0000e35b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE35B	16488 bytes
SHA-256: `adb337bf33b7bd7f9377a53edc784b0b5bff712d90a338003b930408f8b477a8`

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