Malicious PDF — malware analysis report

Static analysis result for SHA-256 690e4600499867ed…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 21:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2086cc26bc290ebc12edf2a77fd6d91 SHA-1: 5a56c22803a8c2364b1c560842d364ee67a4345d SHA-256: 690e4600499867eda77415b1bf2629b5cea4439c38ff9a6e0d18569de7fff448
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into visiting the malicious URL. No scripts were extracted, but the presence of an external URI strongly indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=chemistry+worksheet+atomic+structure+and+isotopes
    • http://favodokoleti.mypressonline.com/keurig_2.0_k300_parts_diagram.pdf
    • http://bapitosegapegi.mywebcommunity.org/megodopuguwele.pdf
    • https://static.s123-cdn-static.com/uploads/4389365/normal_60082e7881886.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_602be988bf775.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_600f5a74d47ea.pdf
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6047b6e1ecaaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aca1886a-0f74-42ea-9e32-e445fe460ebf/76675105745.pdf
    • https://uploads.strikinglycdn.com/files/89192a51-82e5-49c3-a241-ba9db7fa73af/simple_and_compound_interest_worksheets_grade_8.pdf
    • https://uploads.strikinglycdn.com/files/f40c95ee-6509-45c8-ae72-bd662c19c8b6/23711694809.pdf
    • https://uploads.strikinglycdn.com/files/2b38be3f-2abc-48a8-bba9-0a17801198c1/calories_in_arbys_chicken_salad_sandwich.pdf
    • https://uploads.strikinglycdn.com/files/6eafc2a6-89eb-4d3c-8a41-dffe4d15bc63/kofezepaz.pdf
    • https://uploads.strikinglycdn.com/files/c72bc3fc-7651-49f9-8804-068b31a83ee6/henry_kissinger_diplomacy_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/0fd28251-419d-4f95-84c1-171c0c410790/57991943763.pdf
    • https://uploads.strikinglycdn.com/files/84e98320-3635-4b6a-9b1f-e743235639f1/ginizaf.pdf
    • https://uploads.strikinglycdn.com/files/ef525cfb-6079-4d72-b389-d2ad0e161970/15533310996.pdf
    • https://uploads.strikinglycdn.com/files/08d22e0f-873a-499e-a051-b77773e595f2/are_keto_diets_bad_for_your_kidneys.pdf
    • https://uploads.strikinglycdn.com/files/e6363f29-9180-40c7-a66f-5d807e37b9fc/argumentative_essay_introduction_paragraph_examples.pdf
    • https://uploads.strikinglycdn.com/files/771a80b9-d482-4cc1-8a79-d5ec7c49d69c/exploration_merit_badge_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/501153e6-e94e-411d-8c92-a308a2b96372/veterinary_assistant_certificate_programs_massachusetts.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_off0000eef7.bin
91b9e3292529f49d57d2348a4045a2a2345caa744134d1f11f548bb1ea2062a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5444 bytes
font_01_sfnt_off00010161.bin
58318878f6850d74e5eea6a5720256359290bd068242ca18ca0c2681fe79ca08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 11340 bytes

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