Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faedd34cf32e206…

MALICIOUS

PDF

93.9 KB Created: 2021-09-08 16:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62c079e0a99d0f2b366d6fd6e5d2b81d SHA-1: b65a7b08d9b8635a41df166822adba18e6fdaf29 SHA-256: 5faedd34cf32e20663cb2c10b004cdef409066fa0ed3c91d5943872ae92a6bf7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing campaigns or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://redac.ch/upload/roranonifuma.pdf In PDF document text
    • https://arerp.kr/data/file///97874730255.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zekajivazajazafolo.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/12363361406132cd6bdc439.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/tezevufebop.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kelukupuwalazasuja.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/disepefivomo.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/63589566798.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/fugituvebenowuru.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/83635629806.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/putug.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fudivobexopepumegiwopage.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109031212484174.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/19262424089.pdfIn PDF document text
    • http://lecostationery.com/files/file/jaxuwovisasemin.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/guvod.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nugok.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/55441691613.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/92887456945.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/jupul.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/42350149805.pdfIn PDF document text
    • http://preiss.at/upload_files/files/sawomolexitowad.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/mulitowexaminubemuvol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=antigone+pdf+oxfordPDF 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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 10380 bytes
SHA-256: 5a7edb0459064fee641ec51efc3e41ba87bf61d2034696db37f14befb177524a
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 21112 bytes
SHA-256: af02a13b490a2934be171ac89fa02ff159c24aab05d3ebcb70b3c5ea67d85c9f

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