Malicious PDF — malware analysis report

Static analysis result for SHA-256 4274b52402049966…

MALICIOUS

PDF

87.4 KB Created: 2021-10-14 02:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0af0c6665d77ea7d464746bd52f224fb SHA-1: 16cd92e019f2243193a47d7cbe40955c063211ed SHA-256: 4274b52402049966dd8d912aa0058accac3f109c5d58ce943faccd32537491c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded links pointing to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful content.

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://groupekineconcept.com/userfiles/file/59979350932.pdf In PDF document text
    • http://mindennapi.hu/upload/file/59300875827.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/38675516565.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/xokudexususerisekedomamip.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/24589228561.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/lujabudinotamizediparar.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/nijirikokajefepazetupofog.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/39957424823.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/bugejemarazi.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/84568672595.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pinamut.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/69712415093.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/50633165386.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/76965290660.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/22458039699.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/letobokaxazuzakavovem.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/xanakapowobel.pdfIn PDF document text
    • https://stvorki.ru/files/file/37918127106.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/19884475921.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/46916819253.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/29627515388.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/85561883335.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/setafig.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100119344003.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=immigration+cartoons+from+american+history+worksheet+answersPDF 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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 10980 bytes
SHA-256: 75c8a3b61b015cbd7b7b1c11d7a8e462ec1cae563c991b3dcb4dc658ec8fb550
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 20508 bytes
SHA-256: 72f95c72adc5a563d162166cdc6611eabb87949cd82f5fa22fe4b8733cdd9e81

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