PDF malware analysis — malicious · 3fd55d5adf6642c0

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 19:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d1ef53d092d1c364440d12027bb7a9cd SHA-1: bc559dfd65d41a7dc42c9c7bb8d4ae6110c491d8 SHA-256: 3fd55d5adf6642c0ec5e9f657bd1667caeb475144b8d56411d72dcb2e80bad38

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates the document likely uses social engineering to prompt the user to execute a command, a common tactic for downloading secondary payloads. Numerous external URLs were extracted, suggesting a link farm or redirection infrastructure used to host or distribute the malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
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://queure.ru/uplcv?utm_term=quick+settings+app PDF link annotation
- https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdfIn PDF document text
- https://smartmedia.ro/app/webroot/files/userfiles/files/57827302928.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///lagodezovusapegetovube.pdfIn PDF document text
- http://suliaok.com/v15/Upload/file/202199013107052.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/16460374907.pdfIn PDF document text
- https://altsovmun.ru/userfiles/file/sezuzasexubudamutowagi.pdfIn PDF document text
- https://lesrimaudieres.com/images/uploads/file/34408607569.pdfIn PDF document text
- http://cappellastudio.it/userfiles/files/31001395413.pdfIn PDF document text
- https://gobelsprofil.com/upload/files/82137541705.pdfIn PDF document text
- http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/viwakagazesi.pdfIn PDF document text
- http://batistar.fr/userfiles/file/73961647897.pdfIn PDF document text
- http://brkvinc.com/userfiles/file/97684101525.pdfIn PDF document text
- https://northcoteplaza.com/userfiles/file/bevidopibopufozejitifin.pdfIn PDF document text
- http://cansuyu.org/resimler/files/90488094807.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/78878275699.pdfIn PDF document text
- https://birsamundapark.in/userfiles/files/39812002229.pdfIn PDF document text
- https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1dd6290d---63536226012.pdfIn PDF document text
- http://noithatsah.com/webroot/img/files/53746116801.pdfIn PDF document text
- https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/69619383954.pdfIn PDF document text
- http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/57831477321.pdfIn PDF document text
- https://institutdesante.org/userfiles/file/52896460672.pdfIn PDF document text
- https://n-vv.dk/userfiles/file/powibonunonirugep.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_off0000ea5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA5D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001026f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1026F	18460 bytes
SHA-256: `633477bcf98b3c0856214b07569b315a9dfe617d83078a010857b91c61cee156`
`font_02_sfnt_off000131e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131E5	10536 bytes
SHA-256: `8d2513a547b5cd48e2576621c56c95f9bc9dccf31cc7ef6489d5ba7042c4cfd8`

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