Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef7a96db660838…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 03:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 602ceb3d4e2b58935f95d05791b51695 SHA-1: 722a9e2637da9e856956b8eab3a9e954639b181a SHA-256: 90ef7a96db66083857c51f1fc667898f3bc1782818d28d1740deb245fde54c3d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=christian+baby+girl+names+pdf PDF link annotation
    • http://bumufirila.mygamesonline.org/blank_risk_assessment_form.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/tedemadejubivur.pdfIn PDF document text
    • http://pelistens.xyz/briggs_stratton_q6500_manualthi0c.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/lojibonojurak_gupuporidalob_sopadadabirotem_jisekeki.pdfIn PDF document text
    • http://godisibipuvam.22web.org/impact_test_experiment_lab_report.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/jumosuwafirev-sakavegifowakof-pimekabule.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/1ebead60e9f1d.pdfIn PDF document text
    • http://rejonanujezeke.22web.org/legunikuriwiluwesatimemi.pdfIn PDF document text
    • http://bloomwithdeanna.com/does_microsoft_office_2010_work_on_windows_xpjll8b.pdfIn PDF document text
    • http://reduslimitaly.website/vezeworenonuzuzoe68ux.pdfIn PDF document text
    • http://teplotronic.ru/how_to_use_keurig_k_elite_iced_coffeene140.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/183253.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/9874780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/amma_amma_song_telugu_video.pdfIn PDF document text
    • http://wopawotejexu.epizy.com/48211066071.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/ver_online_el_nombre_de_la_rosa_subtitulada_espaol.pdfIn PDF document text
    • http://vanopibabo.rf.gd/swagger_ui_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/dokuziweva.pdfIn PDF document text
    • http://rowesotinik.rf.gd/26948185095.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/soxotefozina.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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 5600 bytes
SHA-256: 0f8a924314372fab7248a533206215d05e08d5a7dbdbbfbc2be08893505ab7e8
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 10628 bytes
SHA-256: 94869561ebc28417a918294080f767c17bfc95d8f1c709fe82991d9a1f2d7b3f

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