Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffab05f42e5611b2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 21:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2a8296dd1a8f30bd6d5921a97ba9076 SHA-1: f718d995a8c1f9881bee30bd432cad396fda4fa2 SHA-256: ffab05f42e5611b2c368834a6da4cc819a20701359e9470b93fa96a2d74f7af5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, suggesting an attempt to redirect users to potentially harmful websites for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=eliminar+historial+android PDF link annotation
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tetivixidezexot.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gozenopisefinovodamosu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/2052159818.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bafejazijolili.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/jamolefawatudik.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/19847423633.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/motivinulobobaj.pdfIn PDF document text
    • https://ysh.my/userfiles/file/witorabobikabisex.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/44204169664.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7cc310799---76966232658.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78088551938.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631790469.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/57933450882.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/89994119730.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b31c66ccfbd9f8fb5fdf6af281f29919/veleted.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/90169357477.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///joforufexunejerugoxep.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/marisafunobidut.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/zawuberizugelisilijifi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kafuxegebibasolopofipogaz.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/12456912835.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 19332 bytes
SHA-256: 544191d273da8b5e36949e72984547a889fdfaf393670f56d0283a954255a0c1
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10364 bytes
SHA-256: 217a3512422dcbefa3f09690f8ba066628c7b76ac42995e5d0abd1ab9d231075

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