Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455b9d7061acda8…

MALICIOUS

PDF

87.9 KB Created: 2021-10-07 18:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70c0eb592b512f5adfdfdeb21e3db1af SHA-1: e1a88d4b8198206d78edeba8c17da79ed46c9e23 SHA-256: 9455b9d7061acda8a1b3691e87a13eb43ab2ddc04b5c55262da342ece036ec79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of embedded URLs and the PDF structure suggest an attempt to obfuscate the malicious intent and distribute further payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f000c2ce4b---luwomokevukamajida.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/2939415787.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/3332417899.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/3519086728.pdfIn PDF document text
    • https://biocoils.com/img/file/jenotexefowexuzidasita.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/88316589440.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/99921160450.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/jujofus.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109250153513111.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/55591621151.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/19886132049.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/38176941056.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/rifexokusozixazawogeso.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/zunubagareru.pdfIn PDF document text
    • http://lizhechem.com/upload/files/22721709789.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/ravuzosexenodu.pdfIn PDF document text
    • http://caratow.be/userfiles/file/xokowukizixesiravaxizu.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/41402904748.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/tuvuwesuxizevovoxewure.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/romuropoladiki.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///36530402926.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1615980af44e93---57353016081.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/zedej.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wubip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=today+t20+match+live+scorePDF 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 19000 bytes
SHA-256: ebfca421a7d227e3ea38c3c2de1ae28378f787282e823a43b9217167e2779662
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 10916 bytes
SHA-256: cd48bcb3d9bf0f912000cbdc4cb8cac72336e2cbb8ed868c54da804ee3a34a96