Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d824c18c6c4b5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 12:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fda2b836d5c7a2c18fe463f1c8ae383 SHA-1: 4b341eb1a8242e39f1d45adf6e6411b798a0fa81 SHA-256: 5b5d824c18c6c4b5f2ec349801caa2bbdaa94b88e5592593a43ed712679b5e62
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1555 Credentials from Password Stores

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is designed as a lure, either for credential harvesting by requesting MFA approval or a one-time code, or to trick the user into installing a malicious browser extension or update. The document contains numerous external URIs, many pointing to distinct disposable hosts, suggesting a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://metabolit.ru/files/file/13843225107.pdf In PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/nokojorifufabi.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/tabuzewenano.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/wofejumoje.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/tewalesixigotesimilo.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruriviladogevajupuzotew.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kubar.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/74525628695.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912083137.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/44957626427.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/gerafube.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/zexiwinuzix.pdfIn PDF document text
    • http://seamacros.com/upload/file/xujamizeborinenetefi.pdfIn PDF document text
    • http://zerosquareonline.com/file/26802854368.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/razipapiru.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fhp2vs3eks9fmr5cp35k2587v/39785226663.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d782c70965---fujizebedato.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/sefezaxewerotilutaxex.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/mifege.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/20720624624.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35295788081.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/95240184479.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/siduzipadasizaf.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/79814364749.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/74378266830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+example+projects+with+source+codePDF 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 11176 bytes
SHA-256: 3620e654610153922df4a886f3084d95d051bb5ad2f772e027b4c6be66309e78
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 16512 bytes
SHA-256: a3be5deb34567061a6b0dd85e1aca9de1bcc405c8f8833bcaf9afc8d6bb06673