Malicious PDF — malware analysis report

Static analysis result for SHA-256 5559748535f7cb25…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 21:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e19cbb60829702461f3a82a9ca73a48 SHA-1: 20b97eba9a27bb07b5c8c1fe1406e360d85ab5dc SHA-256: 5559748535f7cb253c3595fd55b8deaa5be4e51aa7825a7d719205b0f0b65f14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=spaceflight+simulator+hack+ios PDF link annotation
    • http://xycrusher.com/d/files/67971159572.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/10363376523.pdfIn PDF document text
    • https://value.ae/userfiles/file/305824925.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/donuninofoleler.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/31667766868.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/97022156889.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905140713.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/89376988417.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-18/20210918060829775364.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/fuzodusinopomos.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/75056406864.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/juwuvanemipi.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bebadagal.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93003583831.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/dadesarodo.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210909014545.pdfIn PDF document text
    • http://evola.it/userfiles/files/38676209388.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36399911155.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/mixegubugababum.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd97b7577---79217771290.pdfIn PDF document text
    • https://activepymes.com/pub/file/sipulexukazareb.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lavax.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29987ecf---15418022471.pdfIn 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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17884 bytes
SHA-256: 83800250f0518e6b161a53eed476181921eba25c5c6e53bd32d67b44a0fabdb7
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 11088 bytes
SHA-256: bee522d3c1df9cbea797f0de71be9ed72f442941f658574e6d963287ec73f703

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