Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d4426b4cbab310…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 08:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3224a02a3295e9580b1d156110414b0c SHA-1: 03410d0a8af86841224faad9b44cd9cc2c5a920c SHA-256: f7d4426b4cbab31009947254071023baa280df445c7a71cf2d84f3db78a4e3a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, one of which is a disposable domain. While no scripts were explicitly extracted, the PDF structure and its function as a gateway to potentially malicious sites suggest an attack pattern involving spearphishing attachments designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://purofirstli.com/userfiles/files/balimigupusonul.pdf In PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/supapakedenaxunujurexa.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/63693364854.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/15624844123.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9aca8bf4---71726621789.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77258027070.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/74108008469.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/lupelimuvonin.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210910_3BD7960992F9B892.pdfIn PDF document text
    • https://servicepapik.ro/files/89490735915.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/tukulafananiveku.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/dadarexitogamedanezopi.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/62461755542.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vovali.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/83880827562.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/14426206475.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/xiparepetotep.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/48766536724.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f7ecbb45---59617550566.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/61519808602.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/mokigupugimitobaladas.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fatovoromod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+game+bola+android+terbaikPDF 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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 10740 bytes
SHA-256: 3b5062662fa4fe5e7da56d2fe73c5dd97e34a5520d1238e2588f9a754c26d148
font_01_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 17364 bytes
SHA-256: 28bc41a2cd21d01d5aa0a695e3b8c11586f4d65038e4f707a4e2179070e3396a
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1