Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f30ef742219fcd…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 00:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 80b792cea595f01f96bea2f19dbcea05 SHA-1: 360eaaa90ae41aa1f36518429e05589878a973e0 SHA-256: 92f30ef742219fcd0937d3a4f8a4e1e39e77704c6f31f1ea78a8c65c5cf5c18f
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 an attempt to download and execute a payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to paste commands into a shell, a common tactic for initiating further malicious activity. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=how+to+take+full+page+screenshot+android PDF link annotation
    • http://mediaworld.pro/ckfinder/userfiles/files/totojimaxelefowumever.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/41232186137.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/68655248980.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/22830985697.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/24774816240.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/jewoxozegufutipomilurorol.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/45870722547.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/jofalag.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/lozowotemupumodirafemeli.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/85772059628.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/70724089660.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/23560074352.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lamasuji.pdfIn PDF document text
    • http://hmed.vn/upload/files/segofivakuxenopakolimowe.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20452345509.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/40962287717.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/214965394.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/34848460519.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/22806431634.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/89006187132.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vupusepofe.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 11168 bytes
SHA-256: 1793df9af678d009dd62d8e44abc3d512ea04f91b5fb2fe8f93314e5c3eccbda
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 20020 bytes
SHA-256: a8b5f1abc0a05aa766e667b12f4c8c6a51bb986fd786b9da1bd1a457846f4c4f
font_02_sfnt_off00013a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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