Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655506197cd347b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 01:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20658837fc1a79e3a7b757b1c294e324 SHA-1: 92d7538da79df56f4927b976f25628f59b2f58c8 SHA-256: 9655506197cd347b2b36810097d3f567ec4b27385398fca8db46a52e5675bd17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious websites, potentially for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tcgardening.com/userfiles/file/2021091401475573499.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2875ae280846c7d4fa8249d6f5f88ffb/ferevumowakivofixu.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/15669117144.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/mumebinebalofugalelu.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/15399351211.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/74934918995.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_19759FD7BAF607C2.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/89746592155.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tuvajidasovisodano.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/tipogiremaberojuxikewibed.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bixomazi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161376ab4b5cd4---fenav.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jigoji.pdfIn PDF document text
    • http://centrons.com/uploaded/file/12589641056135c4605740c.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/22498362559.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/lafitosolekogitogen.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/51488855394.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/87680757731.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/liderovuwazupezosufen.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bonositupofij.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109200356219818.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/92404562672.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///56388383386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=software+user+interface+examplesPDF 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_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 17836 bytes
SHA-256: 04a94454de722f38da2327c7d672f237869171656279c5e85c7b6cf36bb44132
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 11004 bytes
SHA-256: 55c9c64ebd21030e81c5d224cd800a6ff5635f8a251ecf1bb5fcad275040df57