Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7bf45ff5b6da4a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 06:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d810d03d649df535937c20dcd112ded0 SHA-1: 20d21b6f5555a2e4438bdf8ab36a1f803cd678cd SHA-256: 5a7bf45ff5b6da4a3dc03118def28a5e642c23f0d4914204d0940b3d72428a7a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maraulsan.com/ckfinder/userfiles/files/20758580983.pdf In PDF document text
    • http://kulturazebrak.cz/userfiles/buxonilifero.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/85417102287.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/9288297021.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sijakufudar.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/60497260296.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84604502036.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/vokajesolologovi.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/52961676775.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/xoloboluxe.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/82294820959.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e18b0ab3b94e6bdd10b3e3332e303fb2/tawevafogepuzokuxiwunibak.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/24724430881.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/badaduzal.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/vofoji.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/sokopajibegixojuzode.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/fafezifiwex.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///girukijuvetazepebaris.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/60777218749.pdfIn PDF document text
    • https://betsin.org/userfiles/files/35429915045.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/99294984817.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee2c585c3---85498258229.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/12793134620.pdfIn PDF document text
    • http://all-premium.com/user_file/files/14966410510.pdfIn PDF document text
    • http://dpengineers.info/admin/userfiles/file/77799245955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=document+camera+app+for+androidPDF 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_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 17808 bytes
SHA-256: f9073565e78f024513215dc568fd50fc2d0817cfbe694bba441e8f4e4fe96300
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 10668 bytes
SHA-256: 67dc16a4eb560cb3c117a8c19112b7128465e579dac97133b4f815b6cff50c86

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