Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc6815fe84a2e16…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 01:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fd00aca08cd81b806713267b9c04cb SHA-1: 762d304b2c69ad66a5b783f82a475142f5acdc61 SHA-256: dfc6815fe84a2e162dec72e399ebdfe7ae5bb59fad961c7dcf827cecaff3c17e
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to essay topics, suggesting a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=good+argumentative+essay+topics+for+7th+graders
    • https://cdn-cms.f-static.net/uploads/4489440/normal_602d68becb5c7.pdf
    • http://doordash.fun/8981048774180h1l.pdf
    • https://cdn.sqhk.co/xovinexesun/gzcAPxm/4572732370.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c558ef6a.pdf
    • https://cdn.sqhk.co/nazujovo/sm8nwje/fitbit_versa_watch_sale.pdf
    • http://virnet77.ru/tefabkwxy6.pdf
    • http://vorecan.space/277653830428ypu6.pdf
    • https://cdn.sqhk.co/kanereneb/fggV3gf/reading_ielts_practice_test_with_answers_2019.pdf
    • https://cdn.sqhk.co/tujuvemevo/gfJYZc9/zombie_hunter_sniper_apocalypse_shooting_apk.pdf
    • https://cdn.sqhk.co/pekebugus/Eibjgie/31700880077.pdf
    • http://dress-russia.ru/check_baseband_version_android7x2wn.pdf
    • https://static.s123-cdn-static.com/uploads/4444655/normal_600092bd09eb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_8ef4cb1a91814e658e750511a95acd0b.pdf?index=true
    • https://s3.amazonaws.com/paxunu/another_eden_mod_apk_1._5._500.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_e109f428d2af4fc2a5c8092ecebf9fc0.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_0f6b3cbbda034d2faf16720d7dea79ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6f028af5-b9e0-4308-93c9-ebd7c1dd0dee/where_can_i_buy_the_amory_wars_comics.pdf
    • https://uploads.strikinglycdn.com/files/685379de-d70e-423b-b0f3-fb890bf7ab54/arguing_about_literature_a_guide_and_reader_3rd_edition.pdf
    • https://s3.amazonaws.com/sizabo/17127562075.pdf
    • https://s3.amazonaws.com/sojebelevenex/the_ugly_truth_book_review.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_edf42fddb85c4795a91cc0a87fd83716.pdf?index=true
    • 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_off0000f94e.bin
eec89af144bd8167dcdb0399cde62e7a833ad5391bfc26c60c1f4fbe7a1abe15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 5808 bytes
font_01_sfnt_off00010d0e.bin
830ce153903b56ba6a3a3b533e4eb55d0791798f9630e8627b632150ffdf26cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 10756 bytes

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