Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a62d3e0453a98…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 23:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1810e8b4f3b897aefb0e4e4fa51efd1a SHA-1: f5f11c47361cd65b89f45605d9cbd190b4580473 SHA-256: 155a62d3e0453a9800f54c39b1050bf56a8326f7e8f0772c7daf9a6445a1e0c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=romeo+and+juliet+modern+english+pdf PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/53452989306.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/60602741347.pdfIn PDF document text
    • http://zzquansu.cn/d/files/55655943912.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/ponowik.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c276a8cdfe---46565486098.pdfIn PDF document text
    • http://trieuduong.com/images/Download/jusanifegaga.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23061242013.pdfIn PDF document text
    • https://denimder.org/resimler/files/90363595173.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6632931051.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912215945.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/kizunox.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xujugamul.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/54607020642.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/gibuxodisixamedagasu.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/83379542093.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/49841828006.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/zomugusot.pdfIn PDF document text
    • http://teakdeck.pl/files/file/bajewilusavufiz.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/vuviv.pdfIn PDF document text
    • http://snft.ro/media/file/wisefakivewuxaxowipimawow.pdfIn PDF document text
    • http://ubest.ru/images/file/pimuvopusudiruwabugebi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/16994775747.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/fufakatip.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/meluvamilugabe.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_F6690F5063DB6322.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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 17132 bytes
SHA-256: 2cb625ae999e63dfe63045e64d5c83a030755f79b9c2a6de3da4def313dc6b5d
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 11220 bytes
SHA-256: ca4b0a5a6d1232ac9846b5c1e59c0ce6c2886b5815ff7e988f7081569901e078
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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