Malicious PDF — malware analysis report

Static analysis result for SHA-256 263fbd5a5a459b12…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 12:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 164d95c88953bc685eab36658991258e SHA-1: 2d6d1822e1c18e269fa96acb3d1d63d8975024f3 SHA-256: 263fbd5a5a459b12013cf01c199eb5240bd52cdf09a2754c0d84376abb119543
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/52649348613.pdf In PDF document text
    • https://invision.buzyhub.com/files/80615519330.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tedirojemowa.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/47922192769.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sadapij.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xekid.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xapakirapenol.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/devaruxutebe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161468bc1647e2---mupewok.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/17815005198.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vugoxizasozozi.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614410d16bc7a.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2324335bf---52513260297.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/dilinofoxilumajozarorisop.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/najegutoboxematurivekok.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/tozetoxivenolujadujixof.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905152558.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/5522671037.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5a95987e4a2c36d657202895d032accf/dulurimojurufipigagavuza.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/vitufedolopeninatopopola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=art+of+war+3+mod+apk+android+1PDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 17532 bytes
SHA-256: 7698c61fc89ab3021f2666cbf46064759412c837bdc33fa4cb69da5ad93ec39e
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10696 bytes
SHA-256: 6c561d414e7ed529ce6728455d85d99079e8dc40cc4c47704d5f6631b1f029b1

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