Malicious PDF — malware analysis report

Static analysis result for SHA-256 f472922cbdd18015…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 09:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce303a9f1f564b710dffcff222bec97b SHA-1: 5db3c572ec6058dfc97d45d6d4d5ae7c4cecd067 SHA-256: f472922cbdd18015126d47a9cb9c600cbb1ccdf53079087e77d020f4ef7189a0
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=borg+cr10+scale+pdf PDF link annotation
    • https://cdn.sqhk.co/ramawuvade/egcbCie/99303232338.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/badulebipidid.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/4gerAig/61051571240.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/18308568234.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/isometric_dot_grid.pdfIn PDF document text
    • http://kupimaxi.sportsontheweb.net/38912300745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5fc9cfa4513bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6041defd8dfa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudupaxub.myartsonline.com/vilegunewi.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_fdfbedc32c9c43d085c349ac08055aa8.pdf?index=trueIn PDF document text
    • http://dijipola.onlinewebshop.net/metal_forming_analysis_book.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_38687db45acd48d7991fae8483f95232.pdf?index=trueIn PDF document text
    • http://fuguzametekobo.myartsonline.com/list_of_common_countable_and_uncountable_nouns.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/ap_reorganisation_act_2020_telugu_version.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/nizekotijunanev.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/dolor_abdominal_agudo_quirurgico.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 5564 bytes
SHA-256: a89e93a3f931a9edb816bf764a221c1f242fed13daae7b4ac1468ca32cf7e552
font_01_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 11268 bytes
SHA-256: 5abd33fe5b4f1b64a95081d6ed7f43836313e911fb588a1b1e0030307aa08507