PDF malware analysis — malicious · c664950fc4158289

MALICIOUS

PDF

86.3 KB Created: 2021-10-12 08:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 5d8cbc4615a94cc627b0034e9d63a52d SHA-1: 0f4528dcee59e490456f06c0854c9367b87134ff SHA-256: c664950fc41582898f7bd95e914908108d1becd98471fe680068a051eceece5f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 5

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.
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=best+way+to+answer+why+should+we+hire+you PDF link annotation
- http://wamer.org/userfiles/file/607526936.pdfIn PDF document text
- https://unovosti.tv/ckfinder/userfiles/files/pekurunaxefigurugor.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/40581134847.pdfIn PDF document text
- http://potlista.com/file/files/negubav.pdfIn PDF document text
- http://importfoodfair.com/userfiles/image/2021/09/file/35040550529.pdfIn PDF document text
- https://nbretail.com.vn/ckfinder/userfiles/files/27484221231.pdfIn PDF document text
- https://www.tahitotfalu.hu/ckfinder/userfiles/files/51913975396.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369b99f1626---41552103847.pdfIn PDF document text
- https://pgprojekt.pl/Upload/file/12076356013.pdfIn PDF document text
- http://blossomtour.net/FileData/ckfinder/files/20210922_0DF99E8E363A8DB1.pdfIn PDF document text
- http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/dujuliz.pdfIn PDF document text
- https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/rawalivutaro.pdfIn PDF document text
- https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/17541962751.pdfIn PDF document text
- https://m-astar.com/UserFiles/files/81533604710.pdfIn PDF document text
- https://wegofa.com/userfiles/file/sutipur.pdfIn PDF document text
- https://wronba.pl/uploads/wysiwyg/file/duvup.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615afebe30eed---91577314710.pdfIn PDF document text
- http://spartapr.com/images/upload/file/50158950958.pdfIn PDF document text
- http://intertermo.nl/userfiles/file/64972637805.pdfIn PDF document text
- http://appinaris.net/ckfinder/userfiles/publics/files/89179817241.pdfIn PDF document text
- http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/votegeporobureze.pdfIn PDF document text
- http://zbraneklapka.cz/ckfinder/userfiles/files/xoxofikutepiworoxo.pdfIn PDF document text
- http://sarkar.ie/userfiles/file/migexewi.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_off0000e723.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE723	10696 bytes
SHA-256: `4ada3d93df949b4e97bd37c41b38cae2ed1ce6ee8fba7300c9821d365eb8c803`
`font_01_sfnt_off0000ffb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFB5	19632 bytes
SHA-256: `640a94e206886193ec54d54c5272f099b8632d7786f177a3d98dd98d39cf61af`
`font_02_sfnt_off00013318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13318	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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