Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b19e446eda6b042…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 08:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d272422355ebe0c09ac8c0bbedb54b92 SHA-1: 1498957ed7565893667a254f5ec2451eb3ac59e1 SHA-256: 3b19e446eda6b042eba370092970d6a3bbedb4aaf497ffe7804fdf534d26f881
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, likely to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and malicious classification suggest it may contain embedded JavaScript or exploit code to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://eia-edu.com/userfiles/file/munobiseteton.pdf In PDF document text
    • http://m3hotels.com/userfiles/file/ruzavoxag.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/folewodudax.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/najupopidudukutafilu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136789ae7223---17648817428.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xonipopasa.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021919426403577.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/50482512737.pdfIn PDF document text
    • https://adium.ru/userfiles/file/58572583766.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/sedixofujovilezeso.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/75463696836.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/33678019555.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sogifegevemawedot.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/guzafuvutobubidofonorij.pdfIn PDF document text
    • https://adci.vn/data/upload/file/88964610428.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zikujoverejevixifesuru.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kunanejotogademegonimunax.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/bosufesagofut.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/94710204067.pdfIn PDF document text
    • http://i-dron.cz/data/file/nozopafuvumilaxekup.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/62890405050.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/25630380606.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/87317eaf2e526873eb7c85dea8558e7e/jejinudigobegekuxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+free+apk+download+old+versionPDF link annotation
    • 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 19504 bytes
SHA-256: 04b9f4fa35c8214507ba2d0f75d33c203d6fec1164467a63a294b2dcd854e8d4
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 10872 bytes
SHA-256: d585328b4fd01a82763c25c7c58e44348504941ba8bfe51c2033dd805b2e250f