Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04129d9dfdc612f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 21:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44553a167bd38d21c3e2ea7efde2aad1 SHA-1: 9133ddac79c1f38e801d906d302611e885984a10 SHA-256: c04129d9dfdc612fc33645677229141b7a415c1ec02f50ff91ab5ddf28cc28a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to or download of malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06b7eefc2246a0602eed40f28b09cf88/zevufani.pdf In PDF document text
    • http://narnivet.com/userfiles/files/94544053525.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/lepiwuxopukug.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/9321596930.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/52945387886.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/bupotudabugiwumaji.pdfIn PDF document text
    • http://koala-al.com/d/files/xegirinujepuwejerofadiw.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/20964602945.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/xedap.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021923356464971.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/gebodeb.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4165157387.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lamosimevejuwebaxirazidu.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/josovulesozawagof.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/51456649429.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/39553399544.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/4094242283.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/faxekonoxixamaputivu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/mugusatolesujedikerufura.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/kurozutunukaxugejekegoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oxford+dictionary+premium+apk+free+downloadPDF 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_off0000ab7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 11132 bytes
SHA-256: 0e47be2628beca67375dd486742ea9dcfdb9c30ef96a0b26acd4570c386b3131
font_02_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16364 bytes
SHA-256: af155c13ab4c9e30e8019c19f69c4417bb4ddba19c94932181485a06869ac150

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