Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc28c737c21a64f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 14:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cafab9e9e20c5eec8fc43c83575776e6 SHA-1: fde862d3a510cfc91ede214641050766fe4e7ecc SHA-256: ccc28c737c21a64f45983d4306f9f627e27d9babbc50bae42f80d8a3d324a0a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/93489444550.pdf In PDF document text
    • http://fzsvybbs.at/userfiles/file/nisuwenavil.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • https://majubesar.com/contents/files/40318161321.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/folofekarerowalug.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1541919027.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/vosegu.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/jisikojalirowimam.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/gutike.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/sefinonatireropexum.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/34270790847.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468d83d576b---54849636650.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/dubumaxotujirokusikakarut.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/12053900979.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210919171929.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/79559158376.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/nirosi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/pamexukedorejajibapizofe.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/joderidurabaxonevuraj.pdfIn PDF document text
    • http://markone-tools.com/upload/files/resep.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/47875377207.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487a190f1bb---gezatebevikuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+xs+vs+s20+fePDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 18988 bytes
SHA-256: 81358271c990389cf2c3fb1d401d5e55f620401e1ccd07ef349340b519e6ac6b
font_01_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 10320 bytes
SHA-256: 589b92117259bca639f7b48a1a19f473e8dd9fd2c64009d760d1aefc4701d5e0
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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