Malicious PDF — malware analysis report

Static analysis result for SHA-256 055df3739a2d70a0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 12:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc1ab5c970ce013eab6b1e8e4fe9f068 SHA-1: ead3e235ab23b151522110b1147cbefba96cd2f5 SHA-256: 055df3739a2d70a0d5813ad9930a83763440ba8be6de1b14f4eb630e0b42bbc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://oprandi.it/userfiles/files/2847661377.pdf In PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/duruk.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/wotemapimef.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wovunik.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/62354149643.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090221480773499.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/36190826012.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/40671548563.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/43643788821.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/95814336860.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109052148223245.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jibiganep.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee50d1d76---81866032358.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rixomonugim.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fu3gtu00psldf1l4baimieu4rt/rimul.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12508372538.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/bomonajupo.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/veredavewojulug.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/19007947603.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/duribe.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/nozorenef.pdfIn PDF document text
    • https://robertbah.si/files/file/piperunuwovovavubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=estados+financieros+completos+de+una+empresa+pdfPDF 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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 10864 bytes
SHA-256: 6e9bf8d5c67bd2945872c805e25e52b40034e0c51f2f66e95a24a22b67298b2c
font_01_sfnt_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 17588 bytes
SHA-256: 996876f88f6b63d890ba9276398bccde7302358f74c2dd0f22b60880543dbbae
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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