Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc8f65fa21d3b90…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 04:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6462173ca37dbd71fe258763484babb1 SHA-1: 3acd3fe7499a006947346994e6f3df5e1bb79555 SHA-256: 6cc8f65fa21d3b9039fa908eb95486f8ebb1013a1200d60fe9d3d8b32b705ab9
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=ancient+rome+study+guide+answers
    • http://lenusabipowezo.getenjoyment.net/andreas_moritz_liver_flush.pdf
    • http://xizerunax.scienceontheweb.net/96500665436.pdf
    • https://cdn-cms.f-static.net/uploads/4481999/normal_602115cd0ee13.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/esl_articles_a_an_the.pdf
    • https://cdn.sqhk.co/fusojafiza/hihiUUB/jump_switch_basketball.pdf
    • http://nokasosozigof.mypressonline.com/kertas_kerja_sarang_burung_walet.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_601bb5da05af6.pdf
    • http://lomigakorak.getenjoyment.net/middle_east_after_world_war_2.pdf
    • http://rowowesofazov.medianewsonline.com/how_much_is_20_extra_credit_points.pdf
    • https://cdn.sqhk.co/demejapad/icbngfW/39666185294.pdf
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5fe0f1bf1e20b.pdf
    • https://cdn.sqhk.co/sesedazaw/hhhi4cw/wordbrain_2_word_star_research_level_1.pdf
    • http://zevewidojodot.mywebcommunity.org/math_puzzle_games_with_answers.pdf
    • https://cdn.sqhk.co/kobadaxo/hg8HYpS/77653273248.pdf
    • https://cdn.sqhk.co/figesuweno/fieC1fa/63902275965.pdf
    • http://xupokaxe.medianewsonline.com/cashier_training_checklist.pdf
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc61da7e094c.pdf
    • https://cdn-cms.f-static.net/uploads/4472793/normal_5fda79522ebec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwosagamivi.myartsonline.com/dexigoretoxutefadix.pdf
    • http://saxodanokijaj.atwebpages.com/27971371114.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_a70b9e15a028474193de75ddb247bbe6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3317f2ae-6c18-45f9-87a7-44bc002bf750/twas_the_night_before_christmas_picture_book_and_jigsaw.pdf
    • https://uploads.strikinglycdn.com/files/e75a7a3c-e27c-43fb-884d-864cce9b4070/sipopigubofunidukaduruxu.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_bf02e0ade08a4071ad76a3a3ca7b569d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ffe5bab-4661-4591-9484-0fa267ab576b/17700833055.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_ec445a89a36740d2ab5984f90f0c7aaf.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_b5f3f17e9ab44845ab72e715f1d6b4b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2e1b43f-9d1c-4803-a911-0a609c1a5e52/fervent_by_priscilla_shirer_free_download.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_3cb441735b884cb3bfb438b6fd069f6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8ceac19-3f39-40a4-ac52-f86ca9dc423c/how_to_program_universal_remote_to_sceptre_tv.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_off0000f2a6.bin
2f6ddf38d91cdd095b384fca29d763c6a4a8f4cb6d96390cec21d554590fb352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 5408 bytes
font_01_sfnt_off0001050c.bin
72084dcc7e0c7f4c47bf4ad9d1f4a5ff614007a539e134ba6d5c090aa7f3dd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 11172 bytes

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