Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa6c19d46101b1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 15:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be5be1f26e3635df3a4e9ad386b97272 SHA-1: 5f961e7ccc66f70f184a6cea3f355165d8c05f7a SHA-256: 8aaa6c19d46101b10849ff2e317d3f5dd48bebad9385ae5ebb92a71fac736ce3
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 redirects the user to one of the numerous unknown URLs, which are likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://npi-management.org/ressource/site-image/files/migijipix.pdf In PDF document text
    • http://blow-w124.com/js/upload/files/86968267295.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/37291156844.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97375997866.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090802281981.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/78356152312.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/27279441871.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/darefakagoduvop.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zoparakujumaselulitap.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/17519112301.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4340578232.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/34288931141.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jodadiginadi.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/vulow.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/50809511897.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kofato.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xukavapazot.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/guvasefotaganikulad.pdfIn PDF document text
    • http://halanmilk.com/upload/files/bosetomelixo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kenebemixabopovazotijide.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912173732352219.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/58534622372.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/tufivux.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/94795128560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=avengers+mobile+game+apkPDF 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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 18904 bytes
SHA-256: a1ad3873a4e0c7d099bf0135aab0a8fff5e7816449b090e867e4e13ced94f5c9
font_01_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 10776 bytes
SHA-256: 9db5f6c280539941f02c49d3dd1eb85c2cf2c2c18c39156a8ab959f77468354f
font_02_sfnt_off00013bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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