PDF malware analysis — malicious · b0f52104e2ca0ef4

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 14:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6f767d78906404e373bf944b68e7ebb1 SHA-1: 112a692d4b724ec4c4d50cae1498d5dc3e721db6 SHA-256: b0f52104e2ca0ef42eeccadbbf5562f0a9e66839cffcce98ea183ff80af3d2ad

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=visual+studio+code+ios+simulator PDF link annotation
- http://bright-inter.com/file_media/file_image/file/51670781837.pdfIn PDF document text
- https://paeonia.ch/userfiles/files/45309977489.pdfIn PDF document text
- https://biodez.lt/i/File/6403594412.pdfIn PDF document text
- http://www.heksan.com.pl/file/zazofe.pdfIn PDF document text
- http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/71669523295.pdfIn PDF document text
- http://robvancampen.nl/userfiles/file/wefobenejulatago.pdfIn PDF document text
- http://epilia.com/upload/FCKEditorfile/gisemufosas.pdfIn PDF document text
- http://makassitools.com/userfiles/file///nefokazojonojipejofonuzi.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161381cda44d60---1767190756.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133b35548f28---30448823662.pdfIn PDF document text
- http://sostrevalli.it/userfiles/files/32204420548.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/46343844968.pdfIn PDF document text
- http://abwcolley.com/uploads/files/34673008341.pdfIn PDF document text
- http://intemhathanh.com/img_duhoc/files/19743817549.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/kefezox.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99d896a1c---velijopadojalunut.pdfIn PDF document text
- http://rajhansnursery.com/userfiles/file/lobowananurazafo.pdfIn PDF document text
- http://www.heksan.com.pl/file/tanabaz.pdfIn PDF document text
- https://thai-airpark.com/ckfinder/userfiles/files/63742505066.pdfIn PDF document text
- https://pemaboutiquehotel.com/assets/userfiles/files/ralibalilisobipozepefoxan.pdfIn PDF document text
- http://armanetti.com/images/82981326501.pdfIn PDF document text
- http://theseadiaries.com/ckfinder/userfiles/files/bepamifaji.pdfIn PDF document text
- http://wpscrm.in/uploaded_files/userfiles/files/49903036438.pdfIn PDF document text
- http://kruengrangthai.com/files/files/jovonasabeposemubobebit.pdfIn PDF document text
- http://alphamarino.kz/images/news/file/laxipixib.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_off0000d9ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9EF	17688 bytes
SHA-256: `06f366064a457c51bdc84913a07a7d3398492b40225c39ee29a61a421bdbc1d6`
`font_01_sfnt_off000107cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011fe3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FE3	10496 bytes
SHA-256: `f13c276842a8ee1cf8d275c70abf456709bed72d05ac23727df64cde0179ca8d`

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