Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0ce21a31241642…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 00:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edc108b48380fd7960c457221506b68f SHA-1: 4ed4e097f7870ce1f76ceaf2cae2e5d0fd704808 SHA-256: 8b0ce21a31241642b7b0ee6ead6362cf7e6b81461ea5f3cbe5e50dc556514c85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=e+balagurusamy+object+oriented+programming+with+c%2B%2B+pdf PDF link annotation
    • http://apluskleaning.com/admin/images/file/76058082428.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/5092640544.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b2b026661566f37febf75c3a000736c7/84537759092.pdfIn PDF document text
    • https://mmtours.si/uploads/kafufivanuriv.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/96422098170.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/67867394057.pdfIn PDF document text
    • http://praguetransfer.com/files/file/59925097404.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/26468493184.pdfIn PDF document text
    • https://basisangka.com/contents/files/19138451449.pdfIn PDF document text
    • http://fedime.org/imagenes/wegegore.pdfIn PDF document text
    • http://grupophi.es/uploads/files/51323907340.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/65413353588.pdfIn PDF document text
    • https://123natura.com/stockages/files/vonajotubemegikifub.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091410384764.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/lininamo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vinababi.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/65339613588.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49677955965.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/juded.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bujositonedukugopunaxob.pdfIn PDF document text
    • https://greenways.at/userfiles/file/80489373586.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132112e32109---75381663012.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/pikuwazad.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/79629806599.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/66029156431.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_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 14692 bytes
SHA-256: 4946076bdd4aaf58e59503c7a0a732b770c689ecbaaccab4c63f44ae3b08c5ac
font_01_sfnt_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 11620 bytes
SHA-256: ff83c98d8e98b51a45825fc524c7a6191bbde9ddf8df69c731e1d43a5b827afa
font_02_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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