Malicious PDF — malware analysis report

Static analysis result for SHA-256 b647d51b8230cd9c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 12:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 994e35044335b193310ea17cf99b6193 SHA-1: a787ebf858ca40adf704769f6312b5d05cb6543e SHA-256: b647d51b8230cd9ccd44dee69239ec564a2ea834d6ab43ba287539170ab4dfc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fizjoactiv.eu/Upload/file/ferukija.pdf In PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/38754362574.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/19723305523.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/bekepozidaririzokesoxibog.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/mimabobal.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/8756639077.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/81355489600.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/34566030889.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gamusipafodifavibima.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/24580366424.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/xofenasegupegopovuti.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/20109160966.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/mebiridasuxofi.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/wetazetojifoxukelamo.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/88333966392.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/puditokodorola.pdfIn PDF document text
    • http://snft.ro/media/file/venanaxepovasozosimeji.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/75541025739.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23610904434.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/joseno.pdfIn PDF document text
    • http://rapet.hu/files/5166553063.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/71433706630.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bonajuxoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+change+your+wallpaper+on+your+phonePDF 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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 16812 bytes
SHA-256: e5022be6fa029681fb141ff5dd15b802a47131f555583b3b6f1ba79b98d6db9b
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 10724 bytes
SHA-256: f6cee765df9d49e1be44f7aaaf78b5467adf8550246d1f9ff4a459caf4728f6a
font_02_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1