Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba4c98f77cba1d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 05:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d1ca824d97a18c6941d25c5fbc07cc1 SHA-1: 5f444ac6e4b70c491973cbfe71ec1807a1c164cd SHA-256: 4ba4c98f77cba1d5b32d41720036e02b4dd0241969abdcaa8d822f7868988b58
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to download and execute further malicious content. The 'Clipboard command execution lure' heuristic strongly suggests the document instructs the user to copy commands into a shell, a common technique for executing downloaded payloads. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+convert+mkv+into+mp4+in+android PDF link annotation
    • http://bebelino.ru/userfiles/file/35834166255.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/80837766120.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/68557280590.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613587b1e95ed---manivi.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kumiloxokogevoverobus.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/83213319629.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/netafulofezepaligupemul.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/rubabagesuzomup.pdfIn PDF document text
    • http://fnathservices.com/upload/file/4092933698.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/94995167122.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/rimilurorutumusenupe.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/28187172758.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/vozogukotomewese.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/25290845738.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e11cc89---97208459762.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/34409787003.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/duziralumuv.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/75454960607.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/94316038950.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/38992490712.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/lojisimiwixogamo.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/tafuzijewipogezo.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 17308 bytes
SHA-256: f2593564fd8896c800f2658518852debc1653b12982fe7250e45406dc062520d
font_01_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 10776 bytes
SHA-256: 17fcf762bbe3fd3ef8ec15ef252fa7d2909f8e546dafb3445582279ec223a21f
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1