Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbd807b9a48b814…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 12:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2db6a7e82f3c9311b258a94dabe9b908 SHA-1: 107943b3639c5ac63d8ce8c133ca6e38e0f48075 SHA-256: 1fbd807b9a48b814adb2a73e2e601c60609281a2493babeaa38eb9d480763414
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Supply Chain Compromise

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to potentially disposable hosting, and includes an instruction to disable security software. While no scripts were directly extracted, the presence of external links and the security bypass instruction suggest an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=app+para+descargar+musica+apk PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e79d57a4---85804258809.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/95245672786.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/wonaxori.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/rulokoguriwegomefijo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907164958699236.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/tupaxir.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/70702628767.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/turabesijuzesogege.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/jogamezisa.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/18296695890.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/revokapekegaxini.pdfIn PDF document text
    • https://pecsikult.hu/files/file/138615234.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/bemodawewaxezonizi.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/terexinejuwanusa.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/vubalexejodonuwexekotileg.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/4557555122.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/ripikigevetupodovoju.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/texova.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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 16980 bytes
SHA-256: c1ea86d17803624b23755deeaefab1e5b863a18c7efe616544b6fe8d5f984886
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10660 bytes
SHA-256: c6c6f81aeeff29883211a3db55dd0f6f00f99692f4e0a6d7cc77a405b86c6327
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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