Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c84776a2979a6e…

MALICIOUS

PDF

76.8 KB Created: 2021-06-04 00:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf95a86228359f50d7dc470217d90441 SHA-1: d760270102da403c232635444ed5a628bbd05165 SHA-256: a7c84776a2979a6e39bfbd466ed50008e62fdcea46d022ae251a35c1226863f1
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that, when clicked, leads to a page offering a download. The document body, though heavily obfuscated, contains text related to 'Need for Speed Underground 2 free download for android tablet', suggesting a lure for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=need+for+speed+underground+2+free+download+for+android+tablet
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdbcf1b5a654.pdf
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6034d163dab5a.pdf
    • https://static.s123-cdn-static.com/uploads/4402740/normal_60076e1b16ef4.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_60648ac1c0644.pdf
    • https://cdn-cms.f-static.net/uploads/4366306/normal_604672e88f0fa.pdf
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5fda729aea497.pdf
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5ffe4ea97a374.pdf
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5fd8f2d81cc51.pdf
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff1ae746513e.pdf
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5ff4c976bb773.pdf
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6022b39351d33.pdf
    • https://cdn-cms.f-static.net/uploads/4464065/normal_60b812f56781f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8aeae2f0-f00b-40c5-891e-74f1017127ff/the_art_of_french_kissing.pdf
    • https://uploads.strikinglycdn.com/files/1161b6a2-7a3f-4429-82ff-613d9198a52f/yamaha_mixing_console_mg10_2_manual.pdf
    • https://uploads.strikinglycdn.com/files/57479e31-b36c-4e4b-ab9e-ca5f294abeb4/89633006727.pdf
    • https://uploads.strikinglycdn.com/files/2bccc088-100d-4839-80a6-a7ed7a3e3792/81552385275.pdf
    • https://uploads.strikinglycdn.com/files/f800ecc5-b0c3-4809-a948-bb7d8f5a466e/karcher_pressure_washer_k4_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e647db01-f4af-4cb3-9dbe-daf6a33b17d3/wolfgang_puck_rice_cooker_instructions.pdf
    • https://uploads.strikinglycdn.com/files/d87777b7-279e-44c8-b87c-d746f748da40/alimentos_y_bebidas_que_los_contienen.pdf
    • https://uploads.strikinglycdn.com/files/c96f6c8e-9b5d-4439-b13b-1d84158aee05/what_is_population_and_housing_census_2021.pdf
    • https://uploads.strikinglycdn.com/files/b6d7aa9d-5f5e-46ee-ad88-f0114ee408ab/how_to_treat_achilles_tendonitis_in_dancers.pdf
    • https://uploads.strikinglycdn.com/files/631e6698-401f-4d12-aa52-5c9b1b721199/kubota_b20_service_manual_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd8.bin
9a4d10d484a4896cd283461fa9299d8d8e694f3c0dfe047328dfe728e687c0dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5540 bytes
font_01_sfnt_off0000ffd5.bin
05d30d050584adc37d74289070830ce44b35f91302faed80b67cd387f8a4795b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10960 bytes

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