PDF malware analysis — malicious · 24010b3ab04504fb

MALICIOUS

PDF

112.9 KB Created: 2021-09-15 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1ff667d3f49152f8cbe855f4c9149d46 SHA-1: 01b7e2b78145820d415b94a46ef6e486c5f47a7f SHA-256: 24010b3ab04504fbe591a907ff8a966eb9b7dda1a6b23770311c675af218e63e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

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://medvor.ru/uplcv?utm_term=frequency+versus+wavelength PDF link annotation
- https://maggies-handmade.com/UserFiles/files/mowanogagesile.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b7b2fb71---49535352291.pdfIn PDF document text
- https://fgcrubochi.com.ng/ckfinder/userfiles/files/beridobezutoledawimow.pdfIn PDF document text
- http://www.aaar.cat/assets/js/ckfinder/userfiles/files/36912100985.pdfIn PDF document text
- http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/sagidazexotitakad.pdfIn PDF document text
- http://rfaaa.com/UploadFile/file/20210911082605323.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/fazexegikikodegab.pdfIn PDF document text
- https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rajowajinerunuvinulipox.pdfIn PDF document text
- http://jacsonsfurniture.com/userfiles/file/24605144483.pdfIn PDF document text
- http://skazka76.ru/pic/userfile/22033034968.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/41853940976.pdfIn PDF document text
- https://greenbins.ca/ckfinder/userfiles/files/vogososeruser.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bae3164e8---51027460337.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/kafezelamixunezitut.pdfIn PDF document text
- http://delfosventures.net/userfiles/files/83343599104.pdfIn PDF document text
- http://tai-group.com/upload/files/88258862463.pdfIn PDF document text
- http://pomodorolennep.de/gfx/userfiles/files/kakuzomekejebunixugup.pdfIn PDF document text
- http://geasit.it/userfiles/files/63952438115.pdfIn PDF document text
- http://tidomusica.com/uploads/files/202109141924024243.pdfIn PDF document text
- http://infinity-c-t.com/userfiles/file/mekalumiguf.pdfIn PDF document text
- http://pyroglobal.sk/app/webroot/files/userfiles/files/59962276345.pdfIn PDF document text
- https://kalendarz.probik.pl/fckeditor/userfiles/file/mexisopodegugigo.pdfIn PDF document text
- http://bluebossa.pl/files/file/sawubenusapadikonogo.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_off00014cdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14CDB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000164f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x164F2	10788 bytes
SHA-256: `abadb1aed617076fe1a740b3cbebc87e30359b261a3ba8e299bef2740379492c`
`font_02_sfnt_off00017d86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17D86	21876 bytes
SHA-256: `ba8daab4aa221fe4745e140e2e7ce8a3ca0c71716d70ebbf6d2a3bd295a05588`

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