PDF malware analysis — malicious · 955bdfc6a441f003

MALICIOUS

PDF

78.3 KB Created: 2021-09-24 08:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: cd47d1198e0b0b6bde6c0d76747b6be1 SHA-1: 0952dbd0873c0d9c537977ec6c3adbf244f546e5 SHA-256: 955bdfc6a441f003f0d4b83c93c2050ed2e367d6fcf7147a7a780bb9af9c81df

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=kenneth+h+rosen+discrete+mathematics+pdf PDF link annotation
- https://wojczak.pl/userfiles/file/zojikafumi.pdfIn PDF document text
- https://icon-studios.com/userfiles/file/zexopunemene.pdfIn PDF document text
- http://albarossa.jp/js/upload/files/kunejijeki.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909041956212208.pdfIn PDF document text
- http://bienbao.org/uploads/files/11413620382.pdfIn PDF document text
- http://zit-tech.com/userfiles/files/83017604459.pdfIn PDF document text
- http://ktai.lmg.jp/upload/file/xunuguvakixofawod.pdfIn PDF document text
- http://spellenindex.nl/images/uploads/69509010085.pdfIn PDF document text
- http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
- https://mama-light.net/business_school/uploads/file/rujufamo.pdfIn PDF document text
- http://envigest.cz/upload/file/pulujirukupugarotawi.pdfIn PDF document text
- http://travelshops.pl/userfiles/file/debogoporodan.pdfIn PDF document text
- http://librojuridico.com/aym_images/files/rofenuzazi.pdfIn PDF document text
- http://rafaelokazakov.com/file/bilomapulojujufupo.pdfIn PDF document text
- http://studiomarcheluzzo.it/userfiles/files/72908652031.pdfIn PDF document text
- http://mirsistem.com/depo/sayfaresim/file/47132160174.pdfIn PDF document text
- http://quiltingacademy.net/fckeditor/userfiles/file/zigebevipetozegurob.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7d88279---3063146994.pdfIn PDF document text
- http://zeci.nl/im/image/32787922126.pdfIn PDF document text
- http://tndgdemo2.com/ckfinder/userfiles/files/83617649026.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9b9a0f8e---94360030472.pdfIn PDF document text
- https://soi.icami.mx/ckfinder/userfiles/files/wujew.pdfIn PDF document text
- https://kidneystonetreatment.in/userfiles/files/zemiloxujab.pdfIn PDF document text
- http://moriefrusca.com/userfiles/files/74981767097.pdfIn PDF document text
- https://www.solucionaesp.com/ckfinder/userfiles/files/17916094730.pdfIn PDF document text
- http://studionegrelli.it/userfiles/files/wejovunajusixaz.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_off0000caf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAF5	10828 bytes
SHA-256: `74f4bcc093650cfabde3d2512abdde78b40f718757a4d37ecab13fbb6ccd9e3d`
`font_01_sfnt_off0000e3c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fbd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBD8	18132 bytes
SHA-256: `e7d577c8073eda9ba065023cd1a1b7d1922e62b4b2e5d8bb41b603ba024442cb`

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