Malicious PDF — malware analysis report

Static analysis result for SHA-256 adffdd5cd5defdd5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 06:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 991f5c4fa5321221cefacda6696aad2f SHA-1: e80b87d2aa2deb862d5799879af46b09bd5c11af SHA-256: adffdd5cd5defdd56eb55e7fa459027107dc8c77216fe03adfecdad0457761db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a primary link to 'https://dafemum.ru/award?keyword=radiographic+cephalometry+pdf', suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9104

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dafemum.ru/award?keyword=radiographic+cephalometry+pdf
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/mikewot.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/0e6ce56567c6.pdf
    • http://najapizarut.22web.org/caldera_spas_pure_comfort_manual.pdf
    • https://cdn.sqhk.co/nomuzali/PHSgjgi/bonnotte_de_noirmoutier_potatoes.pdf
    • https://cdn.sqhk.co/joxopejufito/AmjfHhi/analisis_dafo_segun_autores.pdf
    • https://cdn.sqhk.co/pisimebuziz/gXijSIF/99717201132.pdf
    • http://gosofejabe.iblogger.org/dadimatogezaxaw.pdf
    • https://cdn.sqhk.co/piwuzuberaze/3jfijgh/8615174766.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/4161242.pdf
    • https://cdn.sqhk.co/dejenuluzew/gcggjg9/36337773068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tawosutosuxi/zozagowu.pdf
    • https://uploads.strikinglycdn.com/files/f4607ee5-ff53-40fb-b3fd-1128538457af/what_is_the_portal_system.pdf
    • https://s3.amazonaws.com/nuselufuzo/dupanotupenon.pdf
    • https://s3.amazonaws.com/baxekojojexusol/system_subsystem_design_document_template.pdf
    • https://s3.amazonaws.com/tinivukedeta/sinonimo_de_busqueda_de_informacion.pdf
    • https://uploads.strikinglycdn.com/files/23e6710e-4903-4b2a-9a3e-819bed3ec3ba/13644099464.pdf
    • https://s3.amazonaws.com/lukepepe/indian_saree_dress_up_games.pdf
    • https://uploads.strikinglycdn.com/files/f99aaf2a-b0cc-455a-9868-e9d5cae70858/the_art_of_living_well_and_finding_happiness_cancer.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbe.bin
5169f4b85d1d4c30ff97f92f72b44b6a225d6257f71a0e01a1bb004a44cb31d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 10380 bytes
font_01_sfnt_off0000ed9a.bin
159d3a71028f0b917911887f88bf29fccc155afa1b932fa6c83783a50dbdd601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5184 bytes
font_02_sfnt_off0000ff52.bin
baccea4cbe3d240ef74b11a2ada62e8e4471c556c7ab394e4e786d1422682bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10320 bytes
font_03_sfnt_off00012265.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 4324 bytes

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