PDF malware analysis — malicious · 24c9403ad7d18c52

MALICIOUS

PDF

89.0 KB Created: 2021-10-06 20:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 03bff5a472e2cbf19a31f68e7f014b88 SHA-1: eca7363be705952c48f6a14c2646064b570cbb3b SHA-256: 24c9403ad7d18c5299d5aea41ee4ed06b5abbaba56942fb0d36b398687b90a1f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to numerous external URLs, suggesting a phishing or malware distribution scheme. The file's structure and numerous external links point towards a link farm or landing page for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=chinese+surnames+alphabetical+order PDF link annotation
- https://alkalacarservice.com/public_html/userfiles/file/naxot.pdfIn PDF document text
- https://venefoil.com/ckfinder/userfiles/files/boraliromifama.pdfIn PDF document text
- http://cafegreenwichvillage.com/uploads/files/tekopozekugige.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/85444175408.pdfIn PDF document text
- https://koratspring.com/upload/file/likumesizo.pdfIn PDF document text
- https://agriturismoilcolle.org/userfiles/file/pagozadinosiz.pdfIn PDF document text
- http://yearbookplus.com/uploads/ckfinder/files/fazuwogunevegegig.pdfIn PDF document text
- https://cmoretv.com/userfiles/753441151.pdfIn PDF document text
- http://gd-weimi.com/upfolder/e/files/20211001235758.pdfIn PDF document text
- https://dulsuc.cl/userfiles/file/14695041104.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/36404573272.pdfIn PDF document text
- http://elitaliaweb.it/upload/file/54176189657.pdfIn PDF document text
- https://sedefartphotography.com/resimler/files/91760086102.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e663a6c7686a3ae55fadd8bcdcbb567/fupuwepafafavisofatika.pdfIn PDF document text
- https://euronuts2009.ge/files/files/34623269448.pdfIn PDF document text
- http://lemonsport.hu/upload/file/58155206360.pdfIn PDF document text
- http://gbfrjournal.org/pds/userfiles/files/71325305239.pdfIn PDF document text
- https://eltonltd.ru/sites/default/files/uploads/70158945076.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bed77562ad---33295307192.pdfIn PDF document text
- http://opuspoint.com/ckfinder/userfiles/files/voxawokuwidefo.pdfIn PDF document text
- http://agrostroi-proekt.ru/ckfinder/userfiles/files/volejexodagepebimepo.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_off0000e48e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE48E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fca0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA0	24552 bytes
SHA-256: `7c815c4b8b1c35ece955a3211dfae274dddc2bbdf18439172e9e54061f2de1ac`
`font_02_sfnt_off00013ba3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BA3	11048 bytes
SHA-256: `cd31deb5730433cacc48c28df8cbc2385a95c6af9ca0240386c9a399cd9ee286`

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