Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3f773ad5adaab1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 04:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4cfd982658f94412c5be75035c3d9cc SHA-1: 38de6cb6a5c98f3761e9c6a8c6313c836cdfd5d9 SHA-256: 4b3f773ad5adaab122ce7b32602390db5d717719f785f55735bb934c1f9b92e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=large+file+transfer+app+android PDF link annotation
    • http://galaxyjewel.cn/uploadfile/files/57023866485.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/89351449243.pdfIn PDF document text
    • http://mcutech.net/files/joserariz.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/refarovedikirilegine.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/dizorapumojuzulef.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8368feda---90406711278.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/36030298456.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/06388a7d634d7de5e2dc52a1f6acbfbc/zuzumojimefonavapitir.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/repiminogonaduzozowunaja.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/15730814016.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/11515853547.pdfIn PDF document text
    • http://capital96.com/userfiles/file/dogolo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/rezizuxunujejonafa.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/96823359027.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/63059060624.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/12258512958.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/soperizelopepiwexalol.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/92684812540.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ruxomela.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/84674129044.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/22536179928.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/24369299012.pdfIn PDF document text
    • http://partnercable.com/files/84463016017.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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 17844 bytes
SHA-256: cad95ed572eabe2731839cea4b76b59c90cf1e5ebb42441bd173e4308afa89bb
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 10632 bytes
SHA-256: 9bfbf515d2123c9fbc3f54c9e0c58331409bc58ce354f994e2a04ef59f5a3029

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