Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a21c647345c97b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 00:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b122998c6ec6e80c0106be8ac13b7c5 SHA-1: 39ff3e1b82d62f657dc4a55938cba193207a5326 SHA-256: 65a21c647345c97bde3a02168044c5c02ebe4f0c758388bd7b057202db9493c6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing, as suggested by the URL content. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to a malicious site.

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://jacksth.ru/award?keyword=antioxidant+activity+of+centella+asiatica+pdf PDF link annotation
    • http://navoviragumaviw.22web.org/52767245983.pdfIn PDF document text
    • http://desokore.medianewsonline.com/ben_hogan_5_lessons_download_free.pdfIn PDF document text
    • http://fasabewaxivotag.iblogger.org/tugevojusofasesofekutuni.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/hp_photosmart_2610_manual.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/kibotareribabokowek.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/1955840183.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/infinix_note_4_price_in_kenya_2018.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/amplitude_modulation_problems.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/wefemabeni/bagevu.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/78370836317.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_4264fd6e86334a668939e87824d2fa98.pdf?index=trueIn PDF document text
    • http://kagejadel.epizy.com/flles_ml_billedkunst.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_092575eb329445fba8afe80de7ee1429.pdf?index=trueIn PDF document text
    • http://musezuw.rf.gd/selibirixovevuxibolavotun.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_e21a0983994e456f906b883b6f39088a.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/edit_file_for_free_online.pdfIn PDF document text
    • http://rebipilu.epizy.com/insecure_love_quotes_images.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/android_java_callback_example.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_373323225d5746058bc14700fb02c79f.pdf?index=trueIn PDF document text
    • http://ximuxulizi.myartsonline.com/devi_puran_in_bengali_free_download.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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5272 bytes
SHA-256: 63b8976e2507fa32aac68614e8b4a982e785449a77a2523e0079ff8cdbb4f067
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10944 bytes
SHA-256: 506ddfd1043dc63f60c42e571318070ad16f548507770282313496b957d01361

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