Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c22ee61292e49f4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 08:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eeee0e80745624be5dbbc18c9f69c94b SHA-1: bd64064ebec237475ddb724c1caabf890cec2901 SHA-256: 8c22ee61292e49f48ab17b88cb80a7af64f74ba1e377abbe41065d316cbf05d2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.005 Security Software Tampering

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one that appears to be a 'windows loader'. The heuristics indicate instructions to disable security software and a lure for a password-protected archive, suggesting a multi-stage attack. The embedded JavaScript is likely used to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=windows+loader+for+windows+7+32+bit PDF link annotation
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/63699981608.pdfIn PDF document text
    • http://lecostationery.com/files/file/jufojipi.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/47725971873.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/75248274397.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/74527977209.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/godejikun.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pigatuxaridube.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/supikove.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/xulufakenok.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/22842456129.pdfIn PDF document text
    • http://ridendo.cz/files/file/rariligolakodujituvex.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210916104355_yg3bgz.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/52514394498.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/jubas.pdfIn PDF document text
    • http://premo.at/userfiles/file/xugenexafipikenagebu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/buvezurixegebutuvusuk.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/jipofebefiravuxukowa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161432c80bd346---nerupefigezewigulomal.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/96817757707.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/kureworugezidudujeborevig.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad33e8bb9cad2b9e7ba0671a991d538a/jeperovituveg.pdfIn PDF document text
    • http://lse.hu/userfiles/file/14081314545.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/60339127880.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/wuselexegixe.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/fedebuvof.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/37924921683.pdfIn PDF document text
    • 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_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10908 bytes
SHA-256: 5bb20cbaa3aef35751808b2763a84134186a91d1b78af62b24b6f0f17738eb12
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 17640 bytes
SHA-256: 433e7b1161a00072792a7703a2ab5dac5bee1f59f1a59370f39266f38df4b83d

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