Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56ac8819b1bcd54…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 21:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57d76397c9f184e7c0c3ce37e17575ae SHA-1: c253053cb8679719d77332cbfeebe04d2c0cf41c SHA-256: b56ac8819b1bcd54ae54211d3ded392f1bc051866ccf8f7970a1ce1c9e550160
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict, pointing towards a phishing lure disguised as study material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=sat+prep+black+book+pdf PDF link annotation
    • http://yourmoneyyourbank.com/uploads/File/wukerudux.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/susiloxo.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/kanilelaxepafomexigen.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/33630946685.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/pekuvaxop.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/miwibetoja.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea0523cfff---fixakepedix.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xiteza.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191892499730.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/051803181799.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/losisowibusiruruve.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/xomifameru.pdfIn PDF document text
    • http://vtaky.sk/media/file/xetiriberamape.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lajigovivusorekexozujaki.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_210704.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/57490179753.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/55041035122.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/81727506243.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/livebigarani.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139392e0d66f---64171168231.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/2846311724.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vexapufajuw.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/41180875041.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_off0000bf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 10556 bytes
SHA-256: 202c166beca07d459dc3400c7e62c42e67ffa19423b1b4b40a10fc2734f751ab
font_02_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17028 bytes
SHA-256: e7daa9df8a786a356070ffb87c3338794f964f3bb9453f1e548abe40b73c45b6

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