Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdf9f2585f02edc…

MALICIOUS

PDF

67.7 KB Created: 2021-03-16 09:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e086d8f0972c98b6c9aaba22e647d3e5 SHA-1: 48de72b1269b00ad2922d8e5acdefdd8be3912d9 SHA-256: 3fdf9f2585f02edc62b013e9f4689a658fd71d06afddcab5e0caea4cb5648b81
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search engine results for driver downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/wix?keyword=ati+radeon+hd+2600+xt+driver PDF link annotation
    • http://forajadafogaxuv.medianewsonline.com/how_to_thread_a_kenmore_model_158_sewing_machine.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/are_apple_books_free_to_download.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/44285247460.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/vTjcjbD/vuguwujenobizonisupezev.pdfIn PDF document text
    • https://cdn.sqhk.co/kepesofuxofi/RO6Xjj9/interior_angles_in_regular_polygons_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/djaibhi/30070493634.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/pezofut/40391159866.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_c435ca5656b741cb9c88eb6adbdc1566.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/noted_with_thanks_for_your_information.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/ssc_result_marksheet_2019_bd.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/sogaginidesuwev.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_4ab8ad1e773b4553b55e03310d76ef73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/nitifajuximi.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/gamubupamejavugenug.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/dark_souls_2_how_to_do_jump_attack.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/sidesejul.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/project_management_for_dummies_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/fujoteru.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_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5248 bytes
SHA-256: 58545b39ae6fea99fea595c03189b9ab38021806fe47930c600004eb638aad22
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 9868 bytes
SHA-256: fc81fe104c26a4bd4a9cc561e63249511832d3d7a84711e0d42d915093f9201f

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