Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e91c0c88263b7a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 12:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e1880c25cf487cfc2f58bd89dd6ee358 SHA-1: ee7512e96844bd501e29f8167c0285dde340f205 SHA-256: 11e91c0c88263b7a36e981cbcf2dd332008a39436cbb187a040f85316359292d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document's structure suggest a phishing or malware distribution attempt, masquerading as educational content. No scripts were extracted, but the presence of numerous external URIs points to the likely intent of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=rational+and+irrational+numbers+worksheet+grade+7+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365607/normal_60149ff1e0017.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/cheighf/essential_biology_for_cambridge_igcse_answers.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/how_to_factory_reset_onkyo_tx-nr609.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/igjfNhi/andromaque_racine_english.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/FlUigjj/10016650399.pdfIn PDF document text
    • http://xalisuvo.22web.org/lazuguseniwuxujopise.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/idiaqvo/xixezoravemune.pdfIn PDF document text
    • http://bepumekelu.22web.org/58028609733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_6001a24cd283d.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/lista_de_verbos_irregulares_en_ingles_past_participle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6023c859e13d0.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/what_is_llb_law_all_about.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_5fe4e9c81f3ab.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/walt_whitman_leaves_of_grass_poem.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/966HTif/knife_fighters_inside_the_white_house.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_b8dfda23c8744004beede2cd95fe3422.pdf?index=trueIn PDF document text
    • http://wubazofebaludo.epizy.com/pelojazape.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/92274749638.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_1088d55cfcd84a4ea98bc5a0590e8acf.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_d7fc166966bc4691b2c17b3f203f156c.pdf?index=trueIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_b92d6a4da238430f82fdc4b7498fe596.pdf?index=trueIn PDF document text
    • http://gumomexad.onlinewebshop.net/agile_project_management_with_scrum.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/nogep.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/adobe_illustrator_export_cmyk.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5840 bytes
SHA-256: e0bb38ebd7362f18f1c62ee2d101b47bd8b58092002010f1a535f15f26e0f007
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 10948 bytes
SHA-256: c57504a91eb9d71232e90e49ad2d11ad0e65cec0abafc037fe0d609daf9b366c

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