Malicious PDF — malware analysis report

Static analysis result for SHA-256 5724fb67306fe29b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 10:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7d6ce735610b1af631300f3cbc50f09 SHA-1: 90f0f6d82f231aeba76c71581ba42ccdb15b15de SHA-256: 5724fb67306fe29bb5a60780f9e1f3b96f534a4f1fe0e355d1a8decd6b6eb49a
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates a social-engineering tactic to prompt the user to install a browser extension or update. Numerous external URLs are present, suggesting the document acts as a gateway to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=chrome+android+crashes+a+lot PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/33579308925.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vogazilegowuperabawuta.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/69277789827.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210901080829-senunarexu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/10883781855.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/vaxizatixudulixe.pdfIn PDF document text
    • http://elpijisystem.com/file/45531368293.pdfIn PDF document text
    • http://yepuco.com/uploads/files/42008556656.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/dogiko.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109111148545388.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/fepenozubokipemus.pdfIn PDF document text
    • http://halmar.info/userfiles/file/96136632535.pdfIn PDF document text
    • http://osayit.com/images/file/5347541066.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/vuruzarumiva.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/80039585890.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140170393407---77316932778.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bavusedebefugowitotonipu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bonajumisaxatu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/14714658476142a9065f919.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/vavemuzazipefepel.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rezudireno.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zomoboxexenefurid.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 10668 bytes
SHA-256: 1e2333ed2b8995c513dcfb8cdf9116f18d2d372ab3230d29827bafd48a694f73
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 17668 bytes
SHA-256: 5956dd84c625dfe588c9ac2047dd88454ad08e0714f9bb291dae5f8e0151164a
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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