Malicious PDF — malware analysis report

Static analysis result for SHA-256 f691c588c31c1b45…

MALICIOUS

PDF

95.9 KB Created: 2021-09-10 03:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7961b651538faaa023540e3f3864d4e7 SHA-1: 0d4d451adec0860a09d100b9a68e7bf431dc504d SHA-256: f691c588c31c1b4538cfaf80d5e57aca0beda055111f3b9e8944b5e936f3db8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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 http://eastcity.hu/ufiles/file/30056153923.pdf In PDF document text
    • http://elskup.pl/images/assets/file/vebivexi.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/vobugikidubolib.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091916551653.pdfIn PDF document text
    • http://adveotec.com/img/file/80074726672.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/44008478793.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/mivagerejokuturev.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d69bbc4f---11671757854.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/xusepexunalosamudater.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/kamenep.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/39596590943.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903085506.pdfIn PDF document text
    • http://sergeybazarov.ru/file/11922137605.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/75409743860.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/77154528033.pdfIn PDF document text
    • http://cloverdiamond.com/file/82406120258.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/58475641516.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/kiwasojanixufepuro.pdfIn PDF document text
    • http://crm333.com/documentos/file/55018629374.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf2a940fb---woriduvobitov.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/redifezezojetagof.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/setedenu.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/432787334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=patent+document+pdfPDF 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_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10476 bytes
SHA-256: 0dcccf28e721b68845998ec1e46f5d51ec53206bd7cb13b9e7be25384c443193
font_01_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 19028 bytes
SHA-256: fbd47d41c39296211eb29b275d86a4b5c6249e5efbe814360784c59ec7028462

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