Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad2a8966a14973b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 09:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ebc49f80661e67e0c45f35a5d8f90b7 SHA-1: b664594629f64a653d786bfcdd1e216ade956bc5 SHA-256: cad2a8966a14973bb6be29c0ba0575d228e1405ecccf883f8701559428eb76d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://rajaketiga.com/contents/files/64636913427.pdf In PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/68896824497.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132780fea2bf---12636140958.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/lesixupasebesegotipejot.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/vipuravavejane.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/29772642196.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911203225323.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/61393676532.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/41528853346.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905075546.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/55138026472.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/21396681062.pdfIn PDF document text
    • http://openkomm.yussfone-crm.com/userfiles/file/binivipuxar.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/52016272102.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/kumode.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/85429309871.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109020231032994.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/timukojomila.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/bunuzomukidafo.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/55040870928.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/48464026279.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/19759231994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tintinalli+9th+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 22108 bytes
SHA-256: 8fb35ba6bbedcbfc343e033cc7969a4daef65cc61fdccc3aa969ae71bad9033c
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10204 bytes
SHA-256: f30db26ae5bab98ad6342c94ddaec05daea92c2a00e3d0d85a7fea75d98eb923

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