PDF malware analysis — malicious · 83bc9f45b2f7d99d

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 10:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 130a0999478272e08a07b1a3f5e908f1 SHA-1: 3781377c8e916407a6b29888c0f8fdc89b32b9e0 SHA-256: 83bc9f45b2f7d99dcd25a722ce8aba95c09380b04d801d250f871bb2d370237c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm with numerous external URLs, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://synerhu.ru/uplcv?utm_term=vidmate+hide+app PDF link annotation
- http://studiozoppini.com/userfiles/files/85247785835.pdfIn PDF document text
- http://buyo-g.net/userfiles/file/ruxigadaxijisurofesi.pdfIn PDF document text
- https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jajowo.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c93f4ed519---bogenasafidep.pdfIn PDF document text
- http://stin-verdon.fr/assets/Image/files/xodomaronixijojabugagop.pdfIn PDF document text
- http://lagostena.it/userfiles/files/fujezonowebadoxobuxozafi.pdfIn PDF document text
- http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/32539615767.pdfIn PDF document text
- http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/kitav.pdfIn PDF document text
- https://grandiosieventinuziali.it/filesUploads/file/85729948287.pdfIn PDF document text
- https://alpinashop.rudy-ra.com/files/24949338492.pdfIn PDF document text
- https://cdmsig1.com/ckfinder/userfiles/files/92110925442.pdfIn PDF document text
- http://peneleos.pl/userfiles/file/bemibalefu.pdfIn PDF document text
- http://www.gieskestukadoors.nl/ckfinder/files/files/73005942979.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/8509878715.pdfIn PDF document text
- https://legyenegyjonapod.hu/userfiles/files/tuvadobebizagumejigojow.pdfIn PDF document text
- https://vrindaindia.com/php/joseph/uploads/file/90047119678.pdfIn PDF document text
- http://glassick.com/userfiles/file/59320797430.pdfIn PDF document text
- https://btcauction.vn/hinhanh/file/98588941409.pdfIn PDF document text
- http://magicfood-cn.com/files/20210909150259.pdfIn PDF document text
- http://dezis.ru/uploads/files/kames.pdfIn PDF document text
- https://035620126.tw/upload/greenkitchen/files/47649971941.pdfIn PDF document text
- https://stonebuild.bg/f/uploads/files/zezawiniw.pdfIn PDF document text
- http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wajunepepesorisotapanibu.pdfIn PDF document text
- http://dealershop.es/camarasegovia/userfiles/file/85824010046.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/54360921449.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_off0000e7ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFC4	10088 bytes
SHA-256: `1c7e8edc35cef85430677817a207d7e528996092c4aadb887f9d4e107ea7f2ec`
`font_02_sfnt_off00011634.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11634	18076 bytes
SHA-256: `388567e1bec9b48e15c298c98d3a4967710f314602ad0724c833d2c3abca2da3`

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