Malicious PDF — malware analysis report

Static analysis result for SHA-256 9371bce56fe3af0e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 16:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81fe527ebd37e622b9816028b954b6a5 SHA-1: 97f2afdf61d67d9abefd3cba3b3417d91673b1e6 SHA-256: 9371bce56fe3af0eae25f9daae36d7c2d2ce11d1c2bc413df92c0dba3f08d67c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of multiple unknown URLs suggests a redirection chain designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/wejaramixovazawaxoj.pdf In PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_4A4F0F7DE0216DF5.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nopakaravimosafuledadosav.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109080757007637.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210904233544.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/95304540815.pdfIn PDF document text
    • http://starma.pl/files/file/kunodiwaxo.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/famudope.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/82809665258.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/togajiwabatonejo.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xumataze.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/91243394280.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/87915988839.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/71878673458.pdfIn PDF document text
    • http://prmakeup.com/Image/files/winufevuza.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387b2a108a4---81250474309.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/zopivilojozaxapalufuzer.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/1801785209.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/reverojabijosufunesa.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/motojegovuse.pdfIn PDF document text
    • http://ecole.ru/text/images/file/67098931837.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed55a4f8a5---61806200370.pdfIn PDF document text
    • http://japhina.com/upload/file/bodupol.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zigexilefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hipaa+compliance+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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 17604 bytes
SHA-256: b47e79a95888fa4080f4aff44b67a8fa942332bbe8cb9620e43d575dc258c9dc
font_01_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 10408 bytes
SHA-256: fb522743d9eb97ad8d53fdcf48eba81b34871213a3e94abcd3222168c39f2b40