Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bd9ef98eba8307…

MALICIOUS

PDF

76.7 KB Created: 2021-03-23 18:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ea0913a500edcdd32266ab4b8d649cbf SHA-1: fdfc9f2843faa1a130738d138a5afaa8607839aa SHA-256: a9bd9ef98eba83079a75b4e98fe71a33bf9d05fcdc5a2159e581997f622c5b12
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a phishing lure related to credit card information. The embedded URL, https://pelibifir.ru/strik?utm_term=o+que+significa+mora+cartao+de+credito+bradesco, is the primary indicator of compromise, likely leading to a malicious site. No scripts were extracted, but the PDF structure and URL suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/strik?utm_term=o+que+significa+mora+cartao+de+credito+bradesco PDF link annotation
    • http://biwedujurar.mywebcommunity.org/96654584484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fcc41c7ba9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fc69f68bb932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611d7bc948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_6035593cdad06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_f9a529ea52b74357b410152d0a362d59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/juvovojililo.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/platformio_ide_atom_dependencies.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/40611676001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fc7e5d-9691-4169-95a2-aeac5ba5bab5/50092108205.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/99687204944.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/most_common_business_english_words.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/13364121509.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/16780008817.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/74118746931.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_1d37362718ff42bb954e4f42f4b0f62a.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_ab59bcc3ed7544a68fc30a6d5e3c0a80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e459374b-69ca-40a8-80b7-3528568ef2b8/16854748563.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/catia_v5_training_report.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6c0f30afd953452980b550bc6aa74149.pdf?index=trueIn 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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5604 bytes
SHA-256: d07b7bfb54ec5d585c6443b926be668bafb6342d73b914356856b38f7f890a47
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 12936 bytes
SHA-256: b330407c819f9bb8eeaaf5c97049408accbe3219d2c146d4ca30344e8e9f7b67

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