Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b3f956182464ab…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0048ea2be8792f1b55f0d475fbcd747 SHA-1: 928b540f200fa059a570b23ad63d43f1c67a1b2a SHA-256: 63b3f956182464abe6352341c9b8aa319092d7d7134c11dd791c6a4ae9f67d5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed numerous embedded external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=elementary+linear+algebra+11th+edition+pdf+solution+manual PDF link annotation
    • https://nileagriculturalindustries.com/file/dezubixitimizowug.pdfIn PDF document text
    • http://anninh247.info/upload/files/zibiru.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613372c683264---17909421905.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/perebinejeg.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/559855491.pdfIn PDF document text
    • http://screen.by/images/file/29548143406.pdfIn PDF document text
    • http://furniture83.com/upload/files/sibolopuki.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/66158292671.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/26031956568.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/mexuna.pdfIn PDF document text
    • http://zae.me/datafiles/file/nowapuv.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dagowirixamugari.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/mejipasubekuti.pdfIn PDF document text
    • http://ttc-investco.com/img/files/33828804969.pdfIn PDF document text
    • https://brukspec.pl/upload/file/87996030967.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/naxiliw.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/mewafamunelapome.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wunugubaguzegoza.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/setevabaxazukasavibuset.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/kidoleworurowuxutilufubul.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/zopomuwisufelaje.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/modoferepegogif.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fd95726378750db36b0fb4b3e7988a79/larexus.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/xusenaviwad.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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 18324 bytes
SHA-256: 7483f55e23f9b38093e19a74542b2747cec1100b7adea1e9e5b00f22fa943649
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 11336 bytes
SHA-256: ad1cad9b8735339a2b90bcbb632cdfcbe05c8287ec797c4bad4c868c83907813

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