PDF malware analysis — malicious · 8411d28da09dcde2

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 01:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3865c7f5ddcf834f39975d74fa6e79e1 SHA-1: 57a4ef3183d62b77c442b3d1c14d6fb3c13df216 SHA-256: 8411d28da09dcde24aaabc3a26b6ddb6e7a4d79f296d6426821d0dfb45804dd0

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Deployment Restriction

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The explicit instruction to disable security software is a critical indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://irlanc.ru/uplcv?utm_term=app+lock+app+apk PDF link annotation
- http://www.mostex.sk/files/articles/file/82545894610.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/61628291610.pdfIn PDF document text
- https://used-machinetools.ro/app/webroot/files/userfiles/files/kifedeman.pdfIn PDF document text
- http://tahyuh.com/uploads/files/202109111116554785.pdfIn PDF document text
- http://lyzebrno.cz/userfiles/file/difeleguwi.pdfIn PDF document text
- http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64075137977.pdfIn PDF document text
- http://chipgene.com/image/files/20210914_040220.pdfIn PDF document text
- http://farmandari-sarvestan.ir/images/news/files/dikolisozuxowero.pdfIn PDF document text
- http://gabident.pl/local/userfiles/file/80729894385.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/futixozexukijusowawugu.pdfIn PDF document text
- http://miraesusan.com/ckupload/files/vozezixefegafexokelewili.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5931f519f3ded495f03e8880aa880ee4/18759790550.pdfIn PDF document text
- http://matraholding.hu/images/userfiles/files/vawifomumusezijemenevuj.pdfIn PDF document text
- http://ibookingkr.com/FileData/ckfinder/files/20210903_498D6F0988585142.pdfIn PDF document text
- http://snft.ro/media/file/vowivigekifas.pdfIn PDF document text
- http://rintoyo.com/userfiles/file/58211207566.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/monafunup.pdfIn PDF document text
- http://enovosti.info/ckfinder/userfiles/files/dolobifexoti.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161415e6743860---gidefivijubevumura.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/zabiwivekowezasise.pdfIn PDF document text
- http://beijingteye.com/upload/files/jikerik.pdfIn PDF document text
- http://awarelaxcentrum.cz/user_files/file/lejimamelunuludimev.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_off0000e7d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFE6	17484 bytes
SHA-256: `ee0e3782ef819f8fa0aa9b001fe010c97b1122a05636e35446aa5f007d9cee10`
`font_02_sfnt_off00012cf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CF5	9744 bytes
SHA-256: `1adab24042a3f77e125d01df0b2954c344b7b74ee1c1cdf17b3a59e5d35e84ab`

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