Malicious PDF — malware analysis report

Static analysis result for SHA-256 285ec9423d612e4a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c664339b79f69d75aa64d6d61e03de4d SHA-1: 380516a4c0c55b7c1fa8eb598acd9703783da552 SHA-256: 285ec9423d612e4af62fb5f6c91f90e7c1643a0dc7a2c186c894675c253ec1cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting an attempt to redirect users to external sites for phishing or malware delivery. The presence of multiple distinct hosts and the 'utm_term_redirector' flag further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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://lighthouse-connection.at/myPix/file/wizavi.pdf In PDF document text
    • https://karpataljaturizmus.hu/upload/21563541844.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/18698620592.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/24195290570.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/febadipegul.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/muxafeje.pdfIn PDF document text
    • http://enewind.com/pliki/file/79760550626.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaab58bff---91424599390.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/45313882136.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/73014974028.pdfIn PDF document text
    • http://kag.fr/userfiles/file/tofimaxutugusevonanubobar.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zilejuxozevofodamizawebav.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dexisimopokotuvabavezozem.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/wejejixenafanusol.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/17233781206.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/mijibiwevulor.pdfIn PDF document text
    • https://marosme.ro/hirek/file/83891457987.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/96185881625.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/xaraxewigubajubapijibak.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/rizidapepu.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/50321079114.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/kipizofekego.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/dedojaluwujati.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/58152261686.pdfIn PDF document text
    • http://oris-am.com/editor_up/biligegoxufopujakiza.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347b4216018---biwuterenesawumaje.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/18824017197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dua+for+eye+inflammationPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 10420 bytes
SHA-256: 0fd02c3c1300f2681bd1356d2e005c5640ec490c742dba0dc6ce3c7d7369e6d1
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16720 bytes
SHA-256: 23e84f692acb066a44c64e7d3c40d97d84f2f81e18d7ad579bfceb54e076fe53