Malicious PDF — malware analysis report

Static analysis result for SHA-256 26229106e83abdd2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 22:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a6e5a682b3f18ab8593ad53e2cc7dfb SHA-1: 5323ca6bbb3fc9af45462491a330c7f75b293632 SHA-256: 26229106e83abdd2abde7e2ba30434e1b91c0c2a3fded9ba6a7197151fbb6c75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to distribute malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=killer+bean+unleashed+hack+apk+free+download PDF link annotation
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/31137155543.pdfIn PDF document text
    • https://ayurmitra.com/files/file/19289273970.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/wilusekuzi.pdfIn PDF document text
    • http://newo.ru/files/files/77098202357.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/46505446155.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/18509306185.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/74134833479.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/nozopugofexisejotepazera.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b520a5e4d---66307627750.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/73671686625.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71679846574.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/7234968737.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/xunowirug.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/95468942806.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/62051209053.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/4418040426.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/48084089.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d7e72215755ed0143f8c673443eff8d/rezawixaxusumine.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/36078684584.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/tozavemufamirulematifixa.pdfIn PDF document text
    • https://limadelimon.com/images/file/jogaraf.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/weredibofaxezidosaxuket.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/91219463358.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/58163949934.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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 18524 bytes
SHA-256: c10cffa5dddf818831d97b0d68462d9538a523794637756a2211a48aaf091880
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 11028 bytes
SHA-256: 933ed6f011700c2054fb82e484fec3930c75cc14a12e5ec314d8a8a26aaec35e

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