Malicious PDF — malware analysis report

Static analysis result for SHA-256 f964a9138ed857e5…

MALICIOUS

PDF

73.7 KB Created: 2021-05-19 18:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b43b62e0c850284cadbd90e789cb08b5 SHA-1: 72b4ccb7ff2f474ac3379082231824b4e581aa9f SHA-256: f964a9138ed857e5472c630f9073cdfe81032ca17265bf51652f2455cd24c080
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-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://bologen.ru/strik?utm_term=how+to+fill+out+seller+disclosure+statement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456376/normal_60585690f296b.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/7958645.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/fabasowasijalug.pdfIn PDF document text
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/4470365.pdfIn PDF document text
    • https://rekaxarekarefov.weebly.com/uploads/1/3/5/3/135300852/tumiveveveg_binemot_xusaru_lovewid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc63fe92df39.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/5f32a9a6-0f7f-4813-895a-fbfb5deab52c/22_clues_level_16.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/is_under_the_dome_finished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc414de9-e087-4a04-b6ca-53361fe3f4f1/10720090059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d6727e-730a-4e13-9bec-215ccd20ff9f/minecraft_survival_island_seeds_bedrock.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/88454671494.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/large_format_camera_vs_digital.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/employee_contract_renewal_letter_format_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa603adc-5759-481a-aa22-4374e356dc40/healthy_vegan_gluten_free_snacks_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/application_format_for_internship_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e093de61-e0d3-42ec-88e9-f97b44d38d8c/common_problems_with_ford_focus_2012.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 5220 bytes
SHA-256: c1a04872cee7cbcc402d879c83840bd5fcefee34e7f029a46cac16f6f9ede2c3
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10276 bytes
SHA-256: e46c1c33709beb106d922eceabf8f538f8d811a80d2934dbf9d916cf0fb5ba21

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