Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8dfb992d49e248…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 02:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 495d75e66dde7d6bf877cc2c2ee8bb11 SHA-1: 39281b78b444fe1798926b01e113fcfb61843ee5 SHA-256: aa8dfb992d49e248de3c01aca36f4c282d91eef2ca41a330041b7fa6b200c337
134 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 high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, including one with a 'utm_term' parameter suggesting a phishing lure, points towards a phishing or malware distribution scheme. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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://irlanc.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BD%D0%B0+android+root+%D0%BF%D1%80%D0%B0%D0%B2%D0%B0 PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92987766649.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/13723429422.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/80229615993.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/25065527432.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/35313935095.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/21845548397.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa925193---43887770572.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pizamufonebiponanovapu.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/netebeminopemepapipomi.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/06/6477874095.pdfIn PDF document text
    • http://findacommodity.com/upload/file/30181296243.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340963d6bdb---kizedavusejizuf.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/23996296525.pdfIn PDF document text
    • http://sayarbobinaj.com/file/ditavivuwezifujap.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gasodexosadakodosavotudaz.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/muwunim.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/durifelidavanuretanur.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87565937153.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/15117196184.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/82745863393.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/xuboso.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/21579533173.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_951E22FCB5ABB6C1.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_off0000b5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A2 22660 bytes
SHA-256: b4f8a34102fc31a267476fdf6e1ceb312a216e83a1682deaa54d438eee28619b
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10884 bytes
SHA-256: 128337fab5bf46c33f1a620d636822b0f77afe8e9342999c93f3d098123aabd4