Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae74aaf83bddbf4…

MALICIOUS

PDF

86.8 KB Created: 2021-10-06 03:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5801aef4051cfec83141ec7e133ddf33 SHA-1: f8019a0d0d09c12f03d67686b50879a9cc1c238a SHA-256: 6ae74aaf83bddbf411579f3f82127cb0c0071eed85dff91d0b840a8b8e2f4059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://penal-garazh.ru/files/77894769329.pdf In PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zaxupataxeniwawuzija.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/59371678760.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/gobekomurogalonulimifu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/36428638180.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/89930083539.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440b544c2ca---deretoxelurakidemozov.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/zudesegavezof.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/wilewoxotonig.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632735117.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-25/20210925232035438420.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210918140407.pdfIn PDF document text
    • http://m2m2design.com/userfiles/67924011902.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/99192548403.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/datudujosodaxetafibadezi.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/58336965046.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/nirafo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/7071831273.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/14206331428.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/94904994531.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/xepevubojemiwemuso.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071425104589.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/92744256013.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/37944117646.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/dabixokomodevijelole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=motor+expressive+aphasiaPDF 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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 20736 bytes
SHA-256: fb8741d112dd032fb6435cead3e6e3f854384549612f45d323173bda582d2fbf
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 10360 bytes
SHA-256: 25f8cd40990c9a7cf4f3b3a82a50e0516bfa27feea36a2d604c89012240d1da8

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