Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e09a028c5af6ae5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-15 19:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1402353dc256f5c200e6a79df12fd47c SHA-1: c5fef3e4274aaa6de982dd411d8c4bf796ffc597 SHA-256: 1e09a028c5af6ae5b602f7a148e943dec2f85f94eee156510c1cfdf6defd8518
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination, likely a malware distribution site. The presence of multiple disposable hosting domains further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 4

  • 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 https://ketchas.ru/uplcv?utm_term=android+flash+files+free+download PDF link annotation
    • http://alianzablue.com/aym_image/files/14098038466.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/64921144415.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/deburuwirugofifenol.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jiwerofofinefadukovazo.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zofimikejuwiwiseperujeb.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zoluret.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/96427682039.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/rekog.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/54730689859.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/97962032811.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/rejuganowonen.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/gitevufezasifexamitimejom.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/98770561733.pdfIn PDF document text
    • http://belniig.by/public/file/63481567642.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zibetuxosawes.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/sibavogerigafunijirefazu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jaremigozu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207da09766---kedadupodivutedu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/65287549657.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/9676994002.pdfIn PDF document text
    • https://computerzone.pk/file/72930107088.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/168l68hkat80no2r40qgdm6p15/rutedukazuwozurez.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/lipatisuvo.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/89965834766.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pobuwumaz.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/49013637742.pdfIn PDF document text
    • 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_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 10420 bytes
SHA-256: f1ef444522eee3b26196897b6662e47189ebf2f319b9f02c697dabff931cd477
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 14392 bytes
SHA-256: 28e267ca51184468ffbfac60d077efb5fdc9d655ef5ee3fafbfe9426d8b9da74