Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f38fb71dc78ec7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 06:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 658c0d5d4ab60a7665b6295b9a7a270c SHA-1: 9196c936c63309d0445a52a884f25b4863151e10 SHA-256: 37f38fb71dc78ec73729e420adf0319423cdcfc41058b63c57a99f19afdd7086
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://formacio.fic.cat/uploads/file/51149083776.pdf In PDF document text
    • https://minipowerpack.net/upload/files/zakudogarowole.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/17478207902.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/23207137162.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/65969787428.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/robatebax.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nixenim.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/woruz.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/41246581694.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/wutalagimufudoj.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/3154605683.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/65009643642.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/30909893544.pdfIn PDF document text
    • http://klenderbio.com/upload/files/xesopuzujuzixiwiwiz.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/91990665175.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/rowaxolepunoxobop.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/xifudibil.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/99248130144.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/fivopozonefi.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/72766967800.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/56835719048.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/rojixexosiduxalibixufu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390136168f2---vumizaberetut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+whole+bee+scriptPDF 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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18112 bytes
SHA-256: d52df8268e1245cd7803701dbe60cacafb41930f1196554ac3a7f3c573b24583
font_02_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 10392 bytes
SHA-256: 8104f34a7f960ac6c79a83fc67cd3fa7edce67712e46f8ae47c43affeec8210a