Malicious PDF — malware analysis report

Static analysis result for SHA-256 542e9b6cadbd3559…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 13:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b57d63459402afdfdb8ab5e12efe789c SHA-1: f52e98eb705f189ec39c4faef808435a9f2f6609 SHA-256: 542e9b6cadbd35593b570ebdeb84b8c7942f561dc8ce9de18874081168214752
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document is designed to trick users into executing commands via copy-pasting into a shell. While no scripts were extracted, the presence of numerous unknown URLs and the nature of the heuristic point towards a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alacartedesign.de/userfiles/file/18041265464.pdf In PDF document text
    • http://4rrecycle.com/files/file/90649757870.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/rarovivoxademozajafudab.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28685874426.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/33232633473.pdfIn PDF document text
    • http://tabletopad.com/images/file/xuvosejozexok.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/20617416178.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/ruwulowejofeburesex.pdfIn PDF document text
    • http://lamay.de/userfiles/file/66161789589.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/nemovanudegevu.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/folozajuzevizabirarolibe.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/topojefuzawizadupe.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/rofumevugusurilonax.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/kapiz.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/refuvomawinadegerepawa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c9e52d998c---59332453793.pdfIn PDF document text
    • http://secretinvitation.net/images/files/rimatulutadaniwimadewevax.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/xekefatarogefisurilij.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/34155006794.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/8884039742.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/anj0t5nhfc9sccoickcl7ulr7d/xividi.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/22850445596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=total+commander+android+tutorial+espa%C3%B1olPDF 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_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 10944 bytes
SHA-256: 1842f468cba04ca1efe4050a8ab467d709a30f86ab5a14bfae64625fc7003271
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 19372 bytes
SHA-256: ce252fc8dd4917968e2a4d89c920d68776de3f48c8812e245a31b6847d7d9faa
font_02_sfnt_off00015094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1