Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf6c3443f997e11…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 17:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03b9a9b73e286df61405ef11e8f29049 SHA-1: 8d46f93b8fa03766706eb906cb91fd46d0c83724 SHA-256: 6cf6c3443f997e11fd5a8e39518ac733eb6637663566a542a4d5df8ed2b3abe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://nomaquito-travel.com/editor-images/regedoxulotudutofevij.pdf In PDF document text
    • https://activsport.ro/userfiles/file/xarutesotetijuxe.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/kexadaxodunigowoxinuxakuj.pdfIn PDF document text
    • http://parfumland.sk/upl/lelogaxuzopodudalunufep.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/bazerowe.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/jomud.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4126947e58ea515ae20d4a9de008d485/wusigegupugafebox.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/dumame.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/fapoxawilurarug.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/zajosezajapa.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/53687829797.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/93404371838.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/zeved.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/11170267159.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/1709693811.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wavotuxudejogub.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/17558365859.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nnuo29jv4hllcqqctbhmd03ehs/9694083338.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/80688052505.pdfIn PDF document text
    • https://mavibusiness.it/file/2485534325.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/614328611d4ed.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/78757092736.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kesawevor.pdfIn PDF document text
    • http://balone.net/_upload/file///17330643093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=meilleur+jeu+gratuit+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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 10476 bytes
SHA-256: bb1806f6a252bf3342ba4317d47aa1b26bab0ba8cc220d906e7fea393764a02a
font_01_sfnt_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 16420 bytes
SHA-256: 621263fa5b2dfdb2bf19ece64959b6db88d67b8848c23c50aff94fe3472acc0d
font_02_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1