PDF malware analysis — malicious · db16608ab591d0bf

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 13:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ca1b2aab1a1a6d6f4d6b05075e205f83 SHA-1: 4cbcec170edd5abe5df13f44003403eea9dc655d SHA-256: db16608ab591d0bf2ddd17111ae58ebcf5762084b22326cc99f609f13bc848a8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it's designed to redirect users to malicious sites. The PDF structure and numerous links indicate a link farm or phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=mods+for+bloons+td+6 PDF link annotation
- https://imotrading.com/images/userfiles/93551676489.pdfIn PDF document text
- https://foodexgida.com/uploads/files/bafavemogaxuwazewerowok.pdfIn PDF document text
- http://stefani.cz/fck/file/47769334863.pdfIn PDF document text
- http://yourmoneyyourbank.com/uploads/File/36261842233.pdfIn PDF document text
- https://inprovitcolombia.com/ckfinder/userfiles/files/89379615941.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcf1285e9---99112717241.pdfIn PDF document text
- http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/dujof.pdfIn PDF document text
- http://techsystem.gr/data/uploads/ckeditor/files/73565079639.pdfIn PDF document text
- https://u-spot.biz/js/ckfinder/userfiles/files/30865603611.pdfIn PDF document text
- https://mackbeks.com/files/file/lomokewufuxijugak.pdfIn PDF document text
- https://nutricount.cz/UserFiles/File/furosenorunosikuxed.pdfIn PDF document text
- http://www.aamuhsv-madisonalumni.org/files/files/gajowaxuwulibugazijewan.pdfIn PDF document text
- http://king-pro.com/userfiles/files/sogenikajodowanapul.pdfIn PDF document text
- https://phoenixturkey.com/upload/ckfinder/files/bilasifiniromaxuvawigiser.pdfIn PDF document text
- http://3dprofi.net/images/uploads/file/xivuruvabixurove.pdfIn PDF document text
- http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/jixidames.pdfIn PDF document text
- https://wickedcheesy.com/images/file/wadukowuxutipegefolil.pdfIn PDF document text
- https://eastshop.ir/data/file/wewubivigav.pdfIn PDF document text
- http://rzn-house.ru/upload/file/sokewuzefakezitiruvol.pdfIn PDF document text
- http://nt-module.ru/ckfinder/userfiles/files/zigaranavuvinobugunen.pdfIn PDF document text
- http://dywin.com/uploadfile/files/pidetepofutamamunelugigo.pdfIn PDF document text
- http://perlawarmii.pl/userfiles/file/kazesibemavoduboretoxej.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33150105945.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/83610271774.pdfIn PDF document text
- https://btsis.com/upload/ckfinder/files/sexesabi.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_off0000b3fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cc13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC13	10260 bytes
SHA-256: `abca47455788281ad20f89cbfb848b25ee43ac223f8800363a7229ad5cd9a0be`
`font_02_sfnt_off0000e343.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE343	16960 bytes
SHA-256: `9b2e5829f2b17821f8994887e5bd645860ece9aef39319c20c62630c8b340158`

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