PDF malware analysis — malicious · f992c64ee5d5e707

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 05:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 853ec11ef3dba4624d9625b595cae737 SHA-1: a63a8f389ccc0a494bbdb402bd7e7cc8ffceee61 SHA-256: f992c64ee5d5e707733449e462a2fa28f69d3a9e392befb12adf6ff312eeb108

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's purpose is to redirect users to a large number of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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 http://yongchengtech.com/uploads/files/202109050643214357.pdf In PDF document text
- http://odumakus.com/uploads/files/48042756607.pdfIn PDF document text
- http://erodiertechnik-wenzel.de/userfiles/file/sudepezonobisadewo.pdfIn PDF document text
- https://quizai.com/uploads/files/latupafirakiwulaj.pdfIn PDF document text
- https://beautydent.hu/editor_up/45221551048.pdfIn PDF document text
- http://due.pt/js/ckfinder/userfiles/files/lesorelowotejekilatedaduz.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af44525267---6729080296.pdfIn PDF document text
- https://majubesar.com/contents/files/novaxunajulidisidibanuso.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a43a952dc---16007259861.pdfIn PDF document text
- http://taispacedesign.com/upload/files/4724492.pdfIn PDF document text
- http://skipjackpoke.com/ckfinder/userfiles/files/92046484650.pdfIn PDF document text
- http://mobilahomedesign.com/userfiles/files/41795190769.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/mewazitewoniguja.pdfIn PDF document text
- http://flamefitnessstudio.com/cewit/images/file/tojarodonenavudipiravip.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/25031805278.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021090807112839.pdfIn PDF document text
- http://winhazel.com/indigo/ckfinder/userfiles/files/fitoxunedepixupigojum.pdfIn PDF document text
- http://gift-founder.com/archive/upload/files/bofejijujabolotaz.pdfIn PDF document text
- http://kbchina.de/upload/tanotamagovoz.pdfIn PDF document text
- http://baoveantam.org/upload/files/68783610870.pdfIn PDF document text
- https://dyaa.club/uploads/file/fedegiluvezed.pdfIn PDF document text
- https://combrooncom.com/contents/files/39259194289.pdfIn PDF document text
- http://haiqi-machine.com/d/files/maxawuler.pdfIn PDF document text
- https://mcdelandes.ca/uploads/file/vuruporanabu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+iwatch+connect+to+android+phonePDF 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_off0000e386.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE386	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fb9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB9D	10512 bytes
SHA-256: `e1707fa2525256edb03b9de0ae3cc2342425a8d9bf177ccd751f6ca740620889`
`font_02_sfnt_off00011388.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11388	19248 bytes
SHA-256: `48c3929c985ab086316dbc9cb5d9b7898456ef6cf51fd1c2a951f8e60726e62a`

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