Malicious PDF — malware analysis report

Static analysis result for SHA-256 621979f71aa80723…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 00:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6de05681cf52a5395ed874884b2b0122 SHA-1: 1b0bb62498bb4ce95d2811bf12402a5b61c276ae SHA-256: 621979f71aa8072384a5d05146ee1eda4fd4351444bb9db8f2cb362284c7f599
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery information from the user. The presence of embedded JavaScript and numerous external URIs, some pointing to potentially malicious domains, suggests an attempt to deliver a malicious payload or redirect the user to a phishing site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jakuverubuvuveduzeke.pdf In PDF document text
    • http://mtecommerce.it/public/news/file/40997348364.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/potudupa.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109132021482572.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jixoguki.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/fejapopasujokivemupuga.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/77506954507.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/64310734163.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/47324638471.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/91016249634.pdfIn PDF document text
    • https://2winit.com/Files/files/fijiwimirir.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/53536539321.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/41222764956.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5765b9fd1778244b98975613ce22ef0e/vedizagati.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/82273095157.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/75752730181.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07dcf0473---lezisusulam.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/nolaberujobodotowu.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903004854_2142569112.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81773430919.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/debojipoz.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gikugitaleke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=yarn+run+envPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 9724 bytes
SHA-256: 63e8e3230d21117e19270809bd1ffdf77830a13c888c318e0a818d6f8de737fc
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 20068 bytes
SHA-256: 65aa7d5d14b37c6a6ca88f6284888109778ece49e56d15dba42023dae52acb63