Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8797311ceb3a268…

MALICIOUS

PDF

73.6 KB Created: 2021-09-30 10:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42321438825ba3eb582292998e9c87f9 SHA-1: e540f2609581e0311312366c433ebb41c97687e3 SHA-256: c8797311ceb3a2687f1dc6c4fbee14b0041f26a4e6321eb14e356ad3796fccb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely redirects the user to a link farm containing numerous PDF files, suggesting a phishing or malware distribution campaign. The presence of multiple unknown URLs points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://skulpt.in/admin/uploads/file/zagowidatuliropigedorot.pdf In PDF document text
    • http://tidomusica.com/uploads/files/202109160024332881.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/kiwudazabawudavak.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lozejunexijejaxu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/gijuwazurazijuk.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/86633897669.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/28813379513.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/juxividozilu.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vazirisumuxevel.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2289_20210908143722.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/rodisapovigunej.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dimupubadudusamurir.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fagoponuvokesotev.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/29242583548.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/57871111574.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rijekotaj.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/29379738209.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96d67098d---xavorolojusikariforosaku.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/jegedekemafopi.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109080310214424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sonsuz+a%C5%9Fk+full+movie+english+subtitlesPDF 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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 17400 bytes
SHA-256: 9c62666c9b9c9a6402fb3b3efa7c595eec768187236d80de6ab9526aa718711e
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 11336 bytes
SHA-256: f0fddd19023a7830867b19b924b5e6181227c15a69272178933bac9007ff3f8b

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