Malicious PDF — malware analysis report

Static analysis result for SHA-256 946833758014f005…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 11:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52a2f58878435e264ffb4f3c56387a32 SHA-1: bb3c4d0e5ec9a7a19d0944ccf0e9cca17ea36cf9 SHA-256: 946833758014f005cd5b79d72e75e3da98050c0848e272724c3397869b90ea2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are flagged as potentially malicious or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tokyomagic.jp/images/library/File/26827602568.pdf In PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/74107047861.pdfIn PDF document text
    • https://alutat.com/data/file/wepup.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/nedikolofonazipo.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/basilowefirofawe.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/54364274286.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/5112562983.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/dikasezironubo.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/dixikiwuzesumena.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/11223457597.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/31539114791.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/23768722496.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/96714256801.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/nabisozejir.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/97723866040.pdfIn PDF document text
    • http://qdjshg.com/files/file/72935157325.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/pezuni.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/febukokoxese.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/70418605871.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/87307826596.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a94b2535---84371743612.pdfIn PDF document text
    • https://linardi.ru/files/file/28330891850.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/80663947565.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/82732675867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hot+chelle+raePDF 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_off0000b3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 15824 bytes
SHA-256: 3a94f9d4abfb9f81cffe17ddd58da4ba08af07d77f1cd4d708f60b7837fc81ab
font_02_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 9952 bytes
SHA-256: a8e8bd27981df069ce987c45d94333dc49af7530cad3a0741e997a892ed1c0b2