Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afe68cee0e55809…

MALICIOUS

PDF

88.0 KB Created: 2021-03-25 00:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50a5681f631150e6aee04d6d4341b8fa SHA-1: 271fffaf96e9566be8b7d84df74abf21e35cc540 SHA-256: 0afe68cee0e55809d3ecc008cbc5c0fd14bd00c2c714cc0a41e0c925e8f4172a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=literary+devices+in+romeo+and+juliet+act+3
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/4702627.pdf
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/4867079.pdf
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/e4e892c79c.pdf
    • https://wuvipovuzodex.weebly.com/uploads/1/3/4/8/134846945/866d96b1f3.pdf
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/juluje-pixolobuzida.pdf
    • https://cdn-cms.f-static.net/uploads/4479237/normal_602ad7cc1987e.pdf
    • http://mafaregasinuviv.22web.org/91774040526.pdf
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/4922630.pdf
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/dilopudozabofiragaxi.pdf
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/koxok_repaba_mukejekoko_kukedarutalono.pdf
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/fedajulilasimubiset.pdf
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fca5cb2df35f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_0de40ae5dfc74aed910a42f6b37f1530.pdf?index=true
    • http://wokesoz.epizy.com/brays_school_tile_cross_uniform.pdf
    • https://uploads.strikinglycdn.com/files/03d3d03a-aa90-4e43-abbe-e4ac455a5814/xukopivutarivipudarudakog.pdf
    • https://uploads.strikinglycdn.com/files/3b5824ef-97f9-421c-83e7-66119fe5b4bb/amartya_sen_idea_of_justice_jurisprudence_notes.pdf
    • https://uploads.strikinglycdn.com/files/9be69659-9771-4afa-89a0-c6095402857b/39094149935.pdf
    • https://uploads.strikinglycdn.com/files/f2eb3d85-f114-45b2-af20-284a6eabc435/the_city_and_the_stars_download.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_e041a7aacafc4dc18d4c15b36edd34b2.pdf?index=true
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_7e6d2c869bdb405a99bc9675f7dcf345.pdf?index=true
    • http://pefimetobibaja.epizy.com/administracion_de_empresas_agropecuarias_concepto.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_off00011be2.bin
4631e4857db783d0273075b19f49def1dc260bc8eb5281a69decf9b5a45b2dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 5428 bytes
font_01_sfnt_off00012e57.bin
556a1242cb879ca25bcf30ec9a14d993045f6e0519b332aa308e08024f87f463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 10564 bytes

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