Malicious PDF — malware analysis report

Static analysis result for SHA-256 18524085b0c831e5…

MALICIOUS

PDF

72.8 KB Created: 2021-04-03 18:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b29c755e2435427d111a7c34633a0e4 SHA-1: c9b70691e4344c90806ff8f19e02e7efeaac3b8d SHA-256: 18524085b0c831e5dbfdcbb9de78144c318ddf5939dddf3654d059eacd3ec5b6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded links suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=communication+skills+test+answers+with+explanations PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/one_less_bell_to_answer.pdfIn PDF document text
    • http://gefomovunodibiw.iblogger.org/tipanebivi.pdfIn PDF document text
    • http://g2am2e.xyz/misipevoxedonumijxmqg.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/socioeconomic_status_philippines.pdfIn PDF document text
    • http://blognews.top/605892766941luft.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/formatos_para_actas_de_reuniones.pdfIn PDF document text
    • https://sisevilabo.weebly.com/uploads/1/3/4/3/134345720/5008763.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/assessment_centre_process.pdfIn PDF document text
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/1937563.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/4150400875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafuwiwoxosom.rf.gd/bluebeam_revu_alternative_for_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07541703-3362-42fd-a11b-b9a8db7b689c/94716692432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725005e9-3305-4a03-ad17-d4b5a6325234/76085018666.pdfIn PDF document text
    • http://wobosososozase.epizy.com/terulozetaxon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb26953-90e3-4f36-83f1-66a2c41d9150/gomezakexaridemugikozaz.pdfIn PDF document text
    • http://mavoweba.epizy.com/lifajelaf.pdfIn PDF document text
    • http://bikumekomem.epizy.com/37822391195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99c7096-7f09-432f-8173-9ee2a477940a/geometry_two_column_proofs_worksheets_with_answers.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 5304 bytes
SHA-256: c364271fb680a840aba008cf1ebb803198f9e810ecb3ddd9b287e6a1c5390e25
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10044 bytes
SHA-256: 8382f462aae1442af69712864fb4d71712f2713758c42974ec5776db75fe092d

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