Malicious PDF — malware analysis report

Static analysis result for SHA-256 827e46bb67a8fa18…

MALICIOUS

PDF

95.4 KB Created: 2021-09-20 13:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6daf85551e883d9fd9d701981478354 SHA-1: f4eae91480e65ad806543c8997d1b30b4e9a86f6 SHA-256: 827e46bb67a8fa189ab8589165a4cab1d69780643742ecbc2a2165d3d8c4ac68
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download and execute further malicious content. The 'Clipboard command execution lure' heuristic strongly suggests the document instructs the user to copy/paste commands into a shell, a common technique for initiating malware execution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://ever0036.com/assets/uploads/ckedit/files/20210916100056.pdf In PDF document text
    • http://gonzagafood.com/userfiles/files/vanavazog.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/pijitobavogoz.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210901033536.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80212361018.pdfIn PDF document text
    • http://grimastone.ru/files/51885895832.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915210429.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/22690475372.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vewekepopitexeratezur.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/80117463992.pdfIn PDF document text
    • https://matratva.in/userfiles/file/pasozaxasug.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zezojusodovimize.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vasuwefakijefo.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/80834314326.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/4712206936.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d48726912---76425987774.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/bobur.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/gefajiwamojigiriralupapo.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/24876380904.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/tanafojurimereg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dual+boot+mojave+and+big+surPDF 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_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 11028 bytes
SHA-256: 1a57456f4223eaf09060168d2bba02b0dec065df255bf404737e8b6b2e49f69e
font_02_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 18192 bytes
SHA-256: d4a92be060905f935a5bbb3c63127f57c45ef80d6da2d9a479b2b48f7e554c9f

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