PDF malware analysis — malicious · 9dfa3db3d278d366

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 20:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 44ceb4825e4574f5ae6bb03c24616030 SHA-1: d4686c5bfa1c33661f76ebe7ddd69b870faeaad3 SHA-256: 9dfa3db3d278d366faea96650dff59df9ed485fe0bc71abb7318d4069bd1f015

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is flagged as malicious by ML classifiers and ClamAV. This script likely redirects the user to external URLs, such as the identified `https://medvor.ru/uplcv?utm_term=dying+light+3+player`, which is a common tactic for phishing or downloading further malicious content. The document's structure and numerous external links suggest it is part of a link farm designed to obscure the ultimate malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=dying+light+3+player PDF link annotation
- http://webinaris.org/ckfinder/userfiles/publics/files/sisimizowobupojobu.pdfIn PDF document text
- http://hwangtosidae.com/userData/ebizro_board/file/bofes.pdfIn PDF document text
- http://mea-travel.pl/userfiles/file/75045062724.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6962a52c---11609376509.pdfIn PDF document text
- https://sangolongphuong.vn/longphuong/news/files/39816512036.pdfIn PDF document text
- https://imahima.xyz/js/ckfinder/userfiles/files/masowafiduxakenufo.pdfIn PDF document text
- https://onlineadda.net/ckfinder/userfiles/files/baluvowaxuwajediwimaxupig.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/lewaforetupujupoxewuzam.pdfIn PDF document text
- https://stealthwindow.tw/uploads/files/202109052033168136.pdfIn PDF document text
- http://intertribo.sk/files/5153176524.pdfIn PDF document text
- http://hoanhaochemical.com/uploads/files/88394458908.pdfIn PDF document text
- http://aatmicscience.org/asuserfiles/file/14575396314.pdfIn PDF document text
- http://mexxeopaint.com/upload/files/86869115405.pdfIn PDF document text
- https://die-elke.de/cms/elke_page_files/file/suruziwab.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/32021743740.pdfIn PDF document text
- http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/bexuma.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/vones.pdfIn PDF document text
- https://nezamirekhaseafoods.com/userfiles/file/55300340119.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/43197701575.pdfIn PDF document text
- http://sportsgarten.com/editorData/file/sulowa.pdfIn PDF document text
- http://phongthuydotho.vn/upload/files/ginobab.pdfIn PDF document text
- http://vitalbafitnessclub.eu/userfiles/files/31086817367.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/lokerovudefised.pdfIn PDF document text
- https://rotitelor.com/contents/files/xerivomediniduj.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_off0000f96b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF96B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001117d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1117D	17892 bytes
SHA-256: `31134814ee3307ea94eb3765a73b44de92a8d8889ce8e172bd5924809141856e`
`font_02_sfnt_off0001401b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1401B	10528 bytes
SHA-256: `54fbbf6b4c7cd4a50bc0d26c0ea6044d3c3b3191d9aed979a450963d2acefe93`

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