PDF malware analysis — malicious · c82ba7ed11dee3f8

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 12:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ea292a49c807ca9f0d42dfb94129e83a SHA-1: 3c9f4a89f950b0f38fbafc2643e30d436d00deea SHA-256: c82ba7ed11dee3f834a7d12bb7250bae0a01681a353d3295c4bca5ba37faf7ea

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded URIs indicate an attempt to direct users to potentially harmful external content, aligning with spearphishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 5

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.
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://crewmak.ru/uplcv?utm_term=naruto+senki+free PDF link annotation
- http://bahtiyardishekimi.com/fckfiles/file/muxojukotave.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7841ed67b---vefas.pdfIn PDF document text
- https://albertoangel.sinecsas.com/ckfinder/userfiles/files/37677117071.pdfIn PDF document text
- https://privatecambodiatour.com/userfiles/file/20644995296.pdfIn PDF document text
- https://tectrongim.com/uploads/file/54923544644.pdfIn PDF document text
- https://newsale.linyn.mobi/upload/ckeditor/pages/files/vogesewuvolomotafata.pdfIn PDF document text
- http://kastely-vacduka.hu/fileok/file/1307170222.pdfIn PDF document text
- http://csc0532.com/userfiles/file/20210905212506_1u7o5a.pdfIn PDF document text
- https://efsanepin.com/calisma2/files/uploads/83803739548.pdfIn PDF document text
- http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_095514.pdfIn PDF document text
- http://sochisushi.nl/survey/userfiles/files/vugiso.pdfIn PDF document text
- http://dieutrimun.myphamkangnam.vn/webroot/img/files/5862923208.pdfIn PDF document text
- https://ratodua.com/contents/files/nasedowuk.pdfIn PDF document text
- https://lemarko.com/userfiles/file/66867427660.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021091103553073499.pdfIn PDF document text
- http://wsm.hk/images/files/21005537391.pdfIn PDF document text
- http://se-ty.ru/uploads/userfiles/file/31496627159.pdfIn PDF document text
- http://findmealocalpainter.com/insurazon/admin/userfiles/file/82079697372.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/84749147167.pdfIn PDF document text
- https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/21821808300.pdfIn PDF document text
- http://maslatalaia.com/userfiles/file/74017697306.pdfIn PDF document text
- https://superchills.com/userfiles/file/sevatutagefiginego.pdfIn PDF document text
- https://dazhonghua1688.com/ckfinder/userfiles/files/dipidoxo.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b34c470f---56562549160.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_off0000c106.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC106	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d91d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD91D	10332 bytes
SHA-256: `f80f23b049333578110a7c3dab098b989c2d3e18e8916d0d49b36357d1539680`
`font_02_sfnt_off0000f09a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF09A	17104 bytes
SHA-256: `15ef3d121e1911fdc3788dcd8dd7dbd187a6d35479458c9b6d457bdbfd3d5313`

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