Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e874a194cba860…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 03:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7346daaa1eaa2d2e6e90fac503177872 SHA-1: 60b6a26fb727949bd353619e6dcf11cd184f60d0 SHA-256: 51e874a194cba86073f9fe8feb83e30e8044a88ee3fcbabe60abc190adbb7638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to trick users into downloading further payloads or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dukeofmarshall.com/ckfinder/userfiles/files/41079417927.pdf In PDF document text
    • http://zezoalza.com/ckupload/files/8353231992.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/neluwapar.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/17936520246.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/45151897415.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/riwowomejubolerog.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gerabujuri.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/68140267657.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/42941319808.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/51250548655.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134535483ab2---rudoli.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/38658646487.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/fakerugezijurod.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/95965713106.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/togadi.pdfIn PDF document text
    • http://mlead.net/images/e/file/zaziduleromamevureveso.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/fudoge.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/tifof.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/12bac1ab7e84297b433cecec4d22772c/75246012221.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/nijorexofuvefunit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+beekeeper%27s+apprentice+pdfPDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10780 bytes
SHA-256: 64fe5a13f1a929dc6e6b156070d731e8f0cbdec62416550c54d3dabf84e43679
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 18124 bytes
SHA-256: 4234ebcb47fa6766dc6fc730e2547b29cbdb8346f9537a15536868232f5facf2
font_02_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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