Malicious PDF — malware analysis report

Static analysis result for SHA-256 af004f84e58159ef…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 00:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ea4d52770222e8eaf76dd67b518c793 SHA-1: 7c1cff455ad34f5c32094d2dcebb8d2f6a15811f SHA-256: af004f84e58159ef752d1bbb8437f4a34b3e188e04c95a1b3fd3ac3ed0fca7f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://hotnewsmd.deca.md/upload/userfiles/files/vobukujorenib.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f85790d381---lirikeguboginotebuf.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/24245266003.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/78884875099.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/sifinijetanupedunote.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/dodemi.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/42866091605.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/solipakizoxelojumabefup.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/barenivoxotepuzipirupime.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/kuvevusewukaf.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913161705.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/40078425517.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/55606176371.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/rirewamonunu.pdfIn PDF document text
    • https://premiersuli.hu/files/files/92702684776.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/webuged.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zebolefakax.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nanidizam.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/69648f07ddfe6eb7e9ac487543528f4d.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/tujobofu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tekoloz.pdfIn PDF document text
    • https://oasis-travel.ro/files/weneg.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/85378295323.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/rabuwevonagimepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+youtube+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_off0000b25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 10400 bytes
SHA-256: c1d47f83236c0eab1fe1a5ff75dedd5e3b87c37fc5053e5c8cce95a21a214f1c
font_01_sfnt_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 15068 bytes
SHA-256: d775a67b02e0d402a1de6a1e63cc4936e9001b03c4cbac78bad6f832ce4dade5

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