Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad3983b3a7dc79d…

MALICIOUS

PDF

87.3 KB Created: 2021-10-15 16:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81f6d84ceb3c735bed10e373bbded4e1 SHA-1: f7e707611258b981f54dd33953d690cae9d2d68d SHA-256: fad3983b3a7dc79d0e08a60e54950102202c6024f2ab816a7f802a8acd79f2cf
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. It contains numerous embedded URLs, with many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is designed to drive traffic to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aarushimukhwas.idealviews.com/userfiles/files/55653185183.pdf In PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/23674606075.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/tukixesawik.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/fesetimaposopurafubomuvo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/guziwaxorunezov.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518ef5f1ff9---votetozenefomuz.pdfIn PDF document text
    • http://anninh247.info/upload/files/wuwetavodij.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/segas.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/45142432126.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17858672880.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/28053585405.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/17908213830.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pebedamifevoridax.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/duxipaguveguperow.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/47327364136.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/69019762834.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/66626917502.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/baromomafa.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/76f095ba682c896ba824a79c41b99bd2/getesujawasotowiwafanuxe.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/2511555260.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/mosuximo.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/toposebazogozemuvu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/ronoripipadarokuxob.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/67629626564.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/bijiregejavawixasin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=mayans+history+in+tamil+pdfPDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 20340 bytes
SHA-256: e93abcc944dcc36bf6634fe61241aee677aa00d63b4f5b3121b001491b7f4312
font_01_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13715 10736 bytes
SHA-256: 72c88503ee7247b28bc959fd00f7cf57cd36a7f88df47cb05e19423412755dca