PDF malware analysis — malicious · 081b77c58e95022a

MALICIOUS

PDF

81.9 KB Created: 2021-10-17 05:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 9a6a8193dcf2bee3ed3c23f40b7fc070 SHA-1: cd4e197b2b55277064b27ecfa39589c9c72f5ab1 SHA-256: 081b77c58e95022a4df09ccfa765d7dc7a834fce7a775078a0b8827dc33d608a

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 delivering malicious content. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://awinresource.com/uploadfile/file/48904115566.pdf In PDF document text
- http://vstarmp.cn/upload/files/20210915_204237.pdfIn PDF document text
- https://eltonltd.ru/sites/default/files/uploads/sigusemofi.pdfIn PDF document text
- http://7serve.org/userfiles/file/20211016073449.pdfIn PDF document text
- http://jamalcar.com/userfiles/file/96852781095.pdfIn PDF document text
- http://61kidsclub.com/userfiles/file/xunodoxalogavi.pdfIn PDF document text
- http://tageedesign.com/ssmpt/documents/file/muragukajiwinavez.pdfIn PDF document text
- http://zjleiou.com/images/upload/File/vebelujogudirinulimugipul.pdfIn PDF document text
- https://floridainvestment.cz/files/file/79346075585.pdfIn PDF document text
- http://englandmatchshirts.com/assets/file/verinumowexo.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161e129d6dde---99820100953.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614380efc2433---gimidozorudemevigut.pdfIn PDF document text
- http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/roruvewalirobapususe.pdfIn PDF document text
- http://queensparkview.com/image/upload/File/fofivetawetigoxused.pdfIn PDF document text
- http://chongros.com/userData/board/file/60790612733.pdfIn PDF document text
- https://www.campacinter.com/image/upload/File/67405016408.pdfIn PDF document text
- http://anindecor.pl/files/file/43589253956.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/bitevodapunutezomena.pdfIn PDF document text
- http://sushinamu.com/uploads/files/32000012753.pdfIn PDF document text
- http://dallard.fr/ressource/site-image/files/tisibalofut.pdfIn PDF document text
- https://autopsrus.aerovents.com/ckfinder/userfiles/files/fajarabemin.pdfIn PDF document text
- http://labonguyenhoang.com/img-chamthi/files/56970041216.pdfIn PDF document text
- http://caytrong.vn/Images_upload/files/demesadosizo.pdfIn PDF document text
- http://biancoacolori.it/userfiles/files/fojazeginadabekawovimutiv.pdfIn PDF document text
- https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=pacific+northwest+property+managementPDF 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_off0000d937.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD937	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f149.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF149	17820 bytes
SHA-256: `e5bec50d8bbbf04196dbb6591b3b2f625b82b7c0d0ada09390d204b388d7e175`
`font_02_sfnt_off00012006.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12006	11080 bytes
SHA-256: `b694688db8eba4bd260ef4baa3c88f23ee68241b9cfef066ead4f1266638f2b0`

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