Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5dccabb3d7dac4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 07:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb9b3acba11aaa17232bc442c530352e SHA-1: c2fcfd978933e6e2eae3189828c35b9c4291f5db SHA-256: cb5dccabb3d7dac45c4d8f6a7317a781b69f189abdb25c01163544eb50cc6580
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of embedded JavaScript streams suggests an attempt to execute malicious code, likely to facilitate the redirection to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=fireboy+and+watergirl+game+unblocked PDF link annotation
    • http://special-pharma.com/upload/files/6306721443.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lupesebirekekamotipaw.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jabizuxekesazes.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210918220010.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tonafunefa.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/41195521256.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/63115399187.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c4de725f9e87cc8937227019deefc1e/61663921032.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/6677026036.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/lozexufe.pdfIn PDF document text
    • http://wirheiraten.de/images/file/bewejakinoser.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vagerite.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/bepajuj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133618b09090---fajugojerokof.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76708971786.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/81208512391.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/59983553955.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/28732569773.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/loruzavajukarawejufijax.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/20345446935.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/5320425850.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/femofoki.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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 11056 bytes
SHA-256: cd94dd3ecd8c42dd1ce7c6e15201e263bc8bb50e11f38f922a7208c77e57bced
font_01_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 19376 bytes
SHA-256: 7d7f86a718525c1b33889bd5b1a23014f1933d2d0949ac81f6109b02b6eb0eaf
font_02_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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