Malicious PDF — malware analysis report

Static analysis result for SHA-256 932e286575196c12…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65455042cc161376b295b483569f6736 SHA-1: efe05a00c47f77eacdaba8a97e66ae1ee190bb2d SHA-256: 932e286575196c129d9a6e23fb179a020ffb3e88e96fce7e0d6afead0def7484
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/sewuve.pdf In PDF document text
    • http://ainut.fi/userfiles/file/giniburusokajobup.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/32617649274.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/gabiror.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904025459.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vilivulezukozosipofodala.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/60077545400.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/43454482785.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/kajasusisivilanaxi.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/lozijokuzoxutuz.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/voriwomifire.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nipixijutu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307db14916c---pufig.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/kubolujubikafixamatol.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea30e9856---87945333458.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/siwojufisekidaved.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630756676.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/54408849300.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/56964181980.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/25926231365.pdfIn PDF document text
    • http://labonscafe.com/userfiles/turozumoximupotenefajevef.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/92496105290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bully+scholarship+edition+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 10880 bytes
SHA-256: 8dcd41b38d0b74aebf34c853834417edc1d9cca5f53aa729c407b78f912d7797
font_01_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 19524 bytes
SHA-256: 4de66cc20c49aeb42bc9b1cb8717f76a025e885876eb3069feb6076264324ca1
font_02_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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