Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1cf918e5561ede…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2df08ec94a439268f0609c2e52a5cd76 SHA-1: 6536846d7f446171b0c6cede36d3bbf03eb99677 SHA-256: ef1cf918e5561eded197c45017e727f3d624710e43f70c09c8256c97d868d719
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=ghost+rider+game+for+android PDF link annotation
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/vaxogazoxazosepekopejug.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/32988935461.pdfIn PDF document text
    • https://edarky.net/data/file/zaligubera.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/kiwopu.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/77060775970.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/70633491784.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/38033888736.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3gh309l06njk1viald7lpln606/rebatinus.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/51657953950.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wikitiwitepetamew.pdfIn PDF document text
    • http://ge-mak.com/files/lutujukowosipizagedununo.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/mowuvopuganufanivi.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nurowonujukagijadogule.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zufitubeladoxumojixo.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/80895825779.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353e2c9a21a---kasesamajedumejabun.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69011759424.pdfIn PDF document text
    • http://rld-carbon.ru/file/77070576360.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/15953381832.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109071444073851.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/12979775077.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/sezagelam.pdfIn PDF document text
    • http://wernitznigg.at/files/61723002085.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/74368203614.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/79777807402.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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 10796 bytes
SHA-256: 54f910e302c34d004650c6c2d7b4b47b65adabfb1f2aff63ad4ba1320777fb20
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 15564 bytes
SHA-256: 951595bf996579fef0f986356c99258bb4d2af1b3b5d406a64921e6fecbd7fcf
font_02_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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