Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6eda422c8434e4b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 23:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7466d00dd7e7a82bfb6033839e651123 SHA-1: 419aaeac37a7671463dc2f0020365533252e620d SHA-256: e6eda422c8434e4b1b10068a97a889aa254f2ab3724e0671bc7802c4bce9d4c4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it uses a browser extension installation lure. The document body is heavily obfuscated, but the presence of numerous external URLs suggests it is designed to redirect the user to malicious sites. The embedded URLs likely serve as part of the lure or to download secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=how+to+get+an+adblock+on+android PDF link annotation
    • https://foursservices.com/nbloom/fckuploads/file/13327006429.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/mokud.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/50686472987.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/32089700248.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/42349460673.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/fimagibinasejowabuzawokoz.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vunuwibomepuj.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109130348595858.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jokikalamemuxiresanop.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/17764632316.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/92224895382.pdfIn PDF document text
    • https://siroyensao.com/upload/files/jewutulamajixoj.pdfIn PDF document text
    • https://etimes.mn/uploads/files/sesupepofima.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614688a22f919---vugesenasigojazosozen.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/fusidusuwumivulozuxeloke.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/kifadilevaposoronixexikak.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zebenejovegin.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/bazuzulaxo.pdfIn PDF document text
    • http://standardamulet.com/files/files/poxotasetogovidozi.pdfIn PDF document text
    • http://silver1979.com/upload/file/22084886368.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.

FilenameKindSourceSize
font_00_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 20792 bytes
SHA-256: 25637a6092542934b4747dfce577a22c7520a6127f6b8f96280777d582f84226
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 10684 bytes
SHA-256: fb8d0a4968ac4f5843cb78f810d22e13cb54866960c60a87ad2f855ccae615f8

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