Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845f8e3cacf194b…

MALICIOUS

PDF

78.7 KB Created: 2021-05-22 08:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e0938d0ddb4e4afef6685c5ab8b7d11 SHA-1: ecafce2aa2bbd5609de76a08dbfef47fec563a49 SHA-256: 1845f8e3cacf194b669a4f5fabf2907eebea7eadbe241f28d540f051c3dc02c5
96 Risk Score

Malware Insights

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

The PDF file contains a URL that mimics a search query, likely intended to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the embedded URL is the primary indicator of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+can+i+lookup+my+work+history+for+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393359/normal_604d02f9a9b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6019ccde91ce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab4142d-a6ad-4825-9c54-4ad3319b02c1/types_of_structural_frames.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604f8847-4506-4673-a78e-a664e57865ab/la_divina_comedia_autor_del_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475a87bb-f5b9-4a0e-bc67-90448080bb59/apc_smart_ups_xs_1500_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/wowekezovogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c8db73-939d-4b84-bb5d-3242c5329c98/37133055299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a060ccc-7ae1-4ea4-bfef-18e2de8c5c3c/weluguxuzepenoturalo.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/danse_macabre_sheet_music_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc15a0-365c-435a-889e-e177ea8f4809/gluten_free_fast_food_mcdonalds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c477a85-e353-4ae4-ad11-c909edc1ffad/writing_systems_of_equations_from_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a25f869-3de1-4a9f-94b2-656450056ed8/475_tax_deductions_for_businesses.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bisulewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8691b9ba-ab10-4da9-b94c-a7607a7db1d0/14204115807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371a5ff3-570e-4cf0-9a25-6fc016ebcd29/lego_mindstorms_card_shuffler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f8487d-8775-437d-99c4-8a136bcae879/83317496814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c01044-c51f-4347-9b83-8f72e857e152/what_is_content_knowledge_management_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ac4cbf-3398-4459-8a30-4a1eed2e08e1/22788132151.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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 5476 bytes
SHA-256: aaa2d1d49c625422358c6ca5b66b99f6434fc078b170afc32eb51a474a973363
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10592 bytes
SHA-256: deb5b293b22a2fbacc3c5e5bd5c15f179907e58340d1bddafae6b25cc176083b

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