PDF malware analysis — malicious · 474b894e20064a63

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 10:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a87193d1bd5b07fcece55183d4628ed0 SHA-1: b8209c507b9a04af79e5023400e501a470babc0a SHA-256: 474b894e20064a63942b2ea7498810711e0115d4c70a421483300fef1e00835a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably used for phishing or to deliver a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/julovavaj.pdf In PDF document text
- http://fractinvest.com/uploads/file/34393882727.pdfIn PDF document text
- http://marcus-1.com/FileData/ckfinder/files/20210907_E231291236DF1269.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614601f00fe44---lapex.pdfIn PDF document text
- http://domkomplekt34.ru/attachments/file/24925474241.pdfIn PDF document text
- http://tomei4x4.jp/js/upload/files/remusuxirazufadizen.pdfIn PDF document text
- http://sunpix.ru/img/lib/file/41412168125.pdfIn PDF document text
- http://talesma.com/E/file/bowalakotema.pdfIn PDF document text
- https://rugsdirect4u.com/uploadedfiles/file/93070002127.pdfIn PDF document text
- http://www.ks-klinika.ru/ckfinder/userfiles/files/zapogarimezit.pdfIn PDF document text
- https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/27120341426.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/mubamekivo.pdfIn PDF document text
- https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/63393383957.pdfIn PDF document text
- https://cakenflowersonline.com/userfiles/file/59670844208.pdfIn PDF document text
- http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161413f57d6966---8771846156.pdfIn PDF document text
- http://mitroc.com/userfiles/file/54778556434.pdfIn PDF document text
- https://aykutemlak.com/upload/ckfinder/files/23639697493.pdfIn PDF document text
- http://szilasfood.hu/pic_upload/files/71071223276.pdfIn PDF document text
- https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/tibofugebesanedar.pdfIn PDF document text
- http://pepinieres-soupe.com/userfiles/file/risofubilisovubasa.pdfIn PDF document text
- https://kidneystonetreatment.in/userfiles/files/vomel.pdfIn PDF document text
- http://kunjipsc.com/uploads/files/xiveregavede.pdfIn PDF document text
- http://marcelponjee.nl/ponjeefiles/file/10803866929.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+broadcast+to+tvPDF 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_off0000c12a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC12A	10372 bytes
SHA-256: `f092042b46badf97fe4b505ff46847f9bbb6aaf5549249830a3b8af20df645cf`
`font_01_sfnt_off0000d8c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8C7	16344 bytes
SHA-256: `03cc5ca6a179daa39f3f302b99861adbec739efaed4aa425fd259a19636382d1`
`font_02_sfnt_off000102d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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