Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb13b26cd6001db2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 17:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5af2d670f9c6ef7bd8c6cb0c3bf62be SHA-1: 2ca50ccab944699808ce9bd63a20c29402114c96 SHA-256: eb13b26cd6001db2f6ddcfc72faa418f799ce43ce1b204f6eba4e6760202bdf8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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 http://kleinschadenexpert.de/userfiles/file/sudezimotefedome.pdf In PDF document text
    • https://actaviaserica.org/board/file/files/xokanuwuw.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210916051746.pdfIn PDF document text
    • http://vce34.ru/attachments/file/mowimosazubojorimifa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71236919876.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/2648430719.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109101245591976.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/13355793234.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/nevepiganizejetad.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/4586967083.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/94962043842.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202194155043041.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140490e613cb---42959200161.pdfIn PDF document text
    • https://cityface.cz/res/file/18755274519.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386c3ecde9a---xolidugoneviburoboxakafik.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109031828164666.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/70156378215.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/44578442142.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/tunupiroliguwibuzep.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/furukipofan.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/71616416143.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/binukavefowadixasawewado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mulan+german+streamPDF 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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 16796 bytes
SHA-256: 46bbbb161ec85cf24db7bb60481a5c6b4571313288daf2e044da7a64aafa038b
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10332 bytes
SHA-256: 0f33dedcaec1fff6b7bb0acaf1ba435436591351a38c621431392ab907ad5523
font_02_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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