Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab246af6f7a19656…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 00:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d91282eabf959233aa86e6279d1ff762 SHA-1: 5677f1fe61c1a3b43369556882524b6acff2887c SHA-256: ab246af6f7a196567f4b8b0695294184bfb1372dc6a9558bf7a0494b0dee095e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6625

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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
  • 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 http://www.santabriganti.org/admin/ckfinder/userfiles/files/23791379344.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/72305856631.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109141518039186.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3496ae15---58515277472.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nuvufifukufaforifo.pdfIn PDF document text
    • http://samtekelektrik.com/files/830223170.pdfIn PDF document text
    • http://videlec.be/ressource/file/90876010778.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/25689330708.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/96936054795.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/femipogopu.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/74828947975.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wasuwusukibuvewuzaxawepi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/48041968347.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jeloxafoletenusojoziduta.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/87497767365.pdfIn PDF document text
    • http://davcpundri.com/css/file/kidexe.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/1372932898.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77382347564.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cede511013---54064956277.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/47215110149.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/21615426083.pdfIn PDF document text
    • http://podarox.ru/public/files/bovute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=other+files+in+storage+androidPDF link annotation
    • 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10660 bytes
SHA-256: c8415158b64be8a81ca96bbe6591b13c29fb37805c8b561dbea5296b2ed8e615
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 18516 bytes
SHA-256: 050d8e2b5619a7ee5b10ac4c6f6a2eaf1e586593a9478d5f763cc33e0ea2be15
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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