Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9e97b8c4148651…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b80d0aa2a5b4fec1a2c2fb5a9d709be SHA-1: 83df25ba5d2d0b3f2e9fd33c06522c621e1a8903 SHA-256: cd9e97b8c41486511197eae2ed29dfd14257925427258db5624997d33a6565e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely using embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://crysiq.ru/uplcv?utm_term=high+paying+office+jobs PDF link annotation
    • http://neteyes.eu/editor_up/12544831451.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/8353454433.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/10350310517.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/39592627082.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/39267282472.pdfIn PDF document text
    • https://bem-sa.com/img/file/zufetalowozoxule.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/45990789130.pdfIn PDF document text
    • http://regmac.net/userfiles/files/pejelilezifuludujazoju.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/3299164204.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-18/20210918015054872575.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109140413493669.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/jobazemiv.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/52584032162.pdfIn PDF document text
    • http://tdbm.vn/upload/files/79432747395.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/fesixeguginapimekizagekod.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/pozovuvagopotap.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/80637858911.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c4f73eba---74293758120.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nabupewedasanutebo.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/67433421719.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/durexujokerovixodafovuku.pdfIn PDF document text
    • https://cardolf.ro/files/13772300544.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/rusoji.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/70358660358.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/dosanejez.pdfIn PDF document text
    • https://fototipia.hu/files/files/16788334636.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://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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 16984 bytes
SHA-256: af7abcc78759dd48376519131f79f915ebc2eccfbb13ce8745d334680dccd439
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10888 bytes
SHA-256: 919fb96fd9d9203f579fc4ad630b520336c0f323f133cf18e5e94618b9ab9d0d

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