Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4cdfe9551d704b…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 03:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eb1fbe17c94ebe9f8d0e42907b240a14 SHA-1: d919c60ab16f37950c42ea233c3a8c3dbc8e7d08 SHA-256: cd4cdfe9551d704b69cd0ab3e0f719ee59bfd8ed785c082e134009823925c09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to documents, suggesting a link farm or SEO poisoning attempt. The primary URL, https://kuzutuzo.ru/award?keyword=livre+pour+apprendre+le+fran%25C3%25A7ais+a1+pdf, is likely part of this scheme to drive traffic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=livre+pour+apprendre+le+fran%25C3%25A7ais+a1+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff1cf440bbb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fce8d36206ab.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/1003943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6019cf012f0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6018c2f1cc6b9.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/9400431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/vertex_form_of_a_quadratic_worksheet_answers.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_c8cf0f475cf44bfca213d825d722e8d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b065dd23-e272-4d43-8b29-4c6574714adb/hp_photosmart_7515_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/hypnovel_data_sheet.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_0f3ede1cd715405e86015ec933e418fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/male_haircut_length_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/kubexonomubapaloleliza.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/executive_summary_template_for_assignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48f3e0b-74f1-4d7e-92a6-0dc33f491896/zatazukosi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/best_budget_android_phones_2019_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/centralismo_y_federalismo_en_mexico.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_4d01d252223f46cdbb7a54a35d3ab0f9.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_2cd5df2f389a4510868a659530c545a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/angry_bird_classic_game_mod_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 5272 bytes
SHA-256: 48e08f18704254ef30c4d92ac832a6c57064ccfc2c51b65e833ca6c87819672c
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 1996 bytes
SHA-256: 1bbbe795d97ad5056cb9a7cfdac547187df42a5edb0bef8372428e02ea751fc7
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 13380 bytes
SHA-256: c9a22be548afeaee5c737dda9dce7ca2abf854ba7d06858d158ed9d393d72882

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