Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce77797e1769564e…

MALICIOUS

PDF

83.4 KB Created: 2021-10-05 20:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5d07f4d74454da1e02ce2f763c51920 SHA-1: 53419396cae3efd03f39ab82bc197c01aa5bf2d0 SHA-256: ce77797e1769564ed945bfd6bbfa8dce82cd3d262a99ed9f5cf9c838f369aadd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. A critical heuristic identified a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell, a common technique for executing secondary payloads. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to potentially disposable domains, supports the phishing lure and the likely download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://gabinetortodontyczny.eu/userfiles/file/miraf.pdf In PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zariva.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/kozulavanajusozilemaporas.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/nutuguwidowazul.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/85945369878.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/81529993635.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/29105213538.pdfIn PDF document text
    • http://kultura-vyazniki.ru/sites/default/files/file/79256749424.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/sixufip.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tugavixibibulukovake.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/2444755289.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/jamokegivexifidi.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671436015.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567f4303466---nirolavapemopibuwunijo.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/23001401249.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/seviked.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/xekevedaxiku.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/wigijezav.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/7780484194.pdfIn PDF document text
    • http://indianamartialartsfitness.com/flash/indianamartialartsfitness.com/file/20049756682.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615421d28afea---robulosewidomujude.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/riraxaronusubimona.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/selojimufexofafugulebu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/menimel.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/10815305410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+much+easierPDF 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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 18948 bytes
SHA-256: 5c92376da60630884879ffadc80fc7ca55baebdf170d8b77440d36959459142d
font_01_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 10424 bytes
SHA-256: 898059956b9ed25adcabd0d79c3ffbe3acaa32824a4175f8ee796028a969430b
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1