Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccabda500e9fb11e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 15:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e29b0fe842b400d21c9d49680c24c17d SHA-1: 407577ec7112288b456705ebf4a7d678830c37be SHA-256: ccabda500e9fb11efc573b014d0d21a40a4279fc68d3ad295b64f63807ea2cd8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://avvolodin.ru/upload/file/pazunudasojorupijananaxe.pdf In PDF document text
    • http://sugarfree-gelato.com/upload/file/36515859409.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/23173870601.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/rirebuwuwoxuxat.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50772594040.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/goponeridu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/61264852037.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/78362672352.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/konavepijonugukoxomuti.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/tuvupoxepoxidajuzijedebeg.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/21499171823.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/79715607380.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vidatirerusokup.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/mutixawukusatisitisabuxo.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kafubijukizu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/99345858959.pdfIn PDF document text
    • http://jn-zhsc.com/upload/wusifojar.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/84711461214.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fenujasorekesafi.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///39779465424.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe33e74d---roxajowinogabasanibotad.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/20422162534.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/mumezepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chrome+android+apkPDF 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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 18200 bytes
SHA-256: 464a12d37813e25df743043e1ebd5c58c269072c0e98e08b3bbba7fe2baf402e
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10468 bytes
SHA-256: ed5b5ebc17244e9a8a38edc0c400f940fcbe3a204a853c34bc98297a39f2a3ff
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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