Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87669da5da33bc4…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 06:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 842ca8cfc0145d15f004abd4b63b8e0d SHA-1: 2bbb15de78d5c2157cfe028e6f0ba3eab80adbea SHA-256: e87669da5da33bc4b741c414a7405ddc43ba9bb6be751c99793a0ccdcd407171
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=h2+physics+definition+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fe439c1a4e8d.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/67161859609t9yat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_602c8caebe94c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_602c3a1895337.pdfIn PDF document text
    • http://axecheat8.xyz/how_to_connect_singing_machine_to_iphone946hv.pdfIn PDF document text
    • http://boforobevuziko.mywebcommunity.org/carpintero_imperial.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/geGjij7/best_100_free_dating_apps_2020.pdfIn PDF document text
    • http://copyrightsupporteds.com/gafafalozasapuvibitokijunq9k45.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/mahatma_gandhi_biodata.pdfIn PDF document text
    • http://kengoru.space/fufujq3c79.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/vafaliwizewalunulovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_6036cce91df61.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/pNih5x9/7237188797.pdfIn PDF document text
    • https://cdn.sqhk.co/tezesafura/dQ1hdjg/8_ball_pool_download_apk_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kelin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e958cf-d581-4e7c-add4-88dc31576299/graficar_distribucion_normal_estandar_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d166360d-e45c-4a71-8534-23b49dc232c4/cobra_360_laser_9_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7367535-c2db-4995-8a78-99feca77616a/how_to_type_into_a_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b5c735-2ec4-45ce-abc4-0251589de0bc/how_to_draw_an_architectural_sketch.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/nagoxadoguwufuwudedemok.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/viduguzezejesuratasumazal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 4920 bytes
SHA-256: 3a4a0b03bb190d6176687efd63491733818b82cea9ee068b11cfa164860186df
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10688 bytes
SHA-256: a7ce178ff20338cae48131aa81ccb53a64751eed156ee838dad71d38c9e643a0
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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