PDF malware analysis — malicious · f6480046552febe1

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 12:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 30abd84540399e57ac1997c4342ee828 SHA-1: b192b7cbc05429f17dbd8e01979e6ab37b551099 SHA-256: f6480046552febe1efd3bb110b9cc551db45918edd2c9a6d33d24d5106bccf62

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/riradekilegogozuma.pdf In PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889db9ca2d---2000543188.pdfIn PDF document text
- http://realtor-madrid.com/uploades/fckeditorfile/tajurugos.pdfIn PDF document text
- http://achilleferolla.it/userfiles/files/goginukefefevumego.pdfIn PDF document text
- https://fotojursa.cz/userfiles/file/pojamatasavoj.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6e81a7c7---52506146052.pdfIn PDF document text
- http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/65523076557.pdfIn PDF document text
- http://mobiliteit.nu/files/18550260581.pdfIn PDF document text
- http://zh-huaxun.com/uploadfiles/files/48326449107.pdfIn PDF document text
- http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/xonarerebuladerukapuz.pdfIn PDF document text
- http://rent2day.ca/ci2/userfiles/files/94345345319.pdfIn PDF document text
- https://petikdaun.com/contents/files/nomudabiw.pdfIn PDF document text
- http://villacappuccina.com/userfiles/files/63747179981.pdfIn PDF document text
- https://kabelkyaobuv.sk/editor_uploads/files/wejod.pdfIn PDF document text
- https://ahl2005.com/ckfinder/userfiles/files/44937627379.pdfIn PDF document text
- http://lukoilmarine.com/ckfinder/userfiles/files/15730272673.pdfIn PDF document text
- http://impex-italia.it/userfiles/files/63577193578.pdfIn PDF document text
- http://gaestehaus-am-erlkoenig.de/img/editor/file/guloluxumob.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee30a1198---laxigugimuxigumamasogi.pdfIn PDF document text
- http://akiisushi.com/uploads/files/91934862642.pdfIn PDF document text
- http://thanhlapcongtykiengiang.com/upload/ck/files/97750339175.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/nusixikimajakawejexafap.pdfIn PDF document text
- https://cauthinh.com/luutru/files/miberigabodenebepidefaj.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+scan+my+android+phone+for+virusesPDF 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_off0000b229.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB229	11100 bytes
SHA-256: `d1309843eb0c1fd053d3348ceb759653ea7dc5060281d3ffbc8c641f4aba7126`
`font_01_sfnt_off0000cbd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBD6	18856 bytes
SHA-256: `26563d2fc7b4f69bfabbb0e68da9041981b793369a428e1cbff0e45d822322bc`
`font_02_sfnt_off0000fd00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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