Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9db30b250fbc392…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 01:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5849812db42ec3d3dec37dec243e1684 SHA-1: 7d90dcaa9a1aed38c09a41d31d57ff4be349086a SHA-256: d9db30b250fbc392cb4f854573c550260baa5e8c6f6b51496c70321d785881dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The high number of external links, many pointing to disposable domains, suggests a link farm or phishing lure designed to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eclearusa.com/images/file/xonesanunufikopaku.pdf In PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/38315154331.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/67517154032.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/buguke.pdfIn PDF document text
    • http://yoron.net/up/files/18406916601.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nonovowe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e4c851e6---83459220364.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/os6flverk6ht3t3ugd03ncjqn6/31383440504.pdfIn PDF document text
    • http://dakov.hu/_user/file/gamuxiboratoloxemuva.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/70576061609.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/68822669781.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/37119292302.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kevuzera.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///885401739.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jenuvugosokeduganonaf.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sofotetebapupija.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/1061186649.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/68649282790.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/vufogalugijuk.pdfIn PDF document text
    • http://teknis.it/userfiles/files/kekefomirepukawuruzeg.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/dotalu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/85521203757.pdfIn PDF document text
    • http://davcpundri.com/css/file/97116634910.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/59312174394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+easy+video+editing+software+for+windows+10PDF 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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10900 bytes
SHA-256: f2155ddd7364a2bd0c93c16f3507fcd36f3dc483a6e3e977de929492ed1a0318
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 17572 bytes
SHA-256: 21a8ad1259a7381f8b018dd53ac55b994817ec20dd770bf1ccbc6563b7bdcc92
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1