Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8d55a5f1ecd806…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 06:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09b28e6b7b4304de079ce904140ac099 SHA-1: 1ff7e6138e11127a02817d44ebfe2aac36b6f967 SHA-256: ab8d55a5f1ecd806a5548529aa47df779633df3e5507a94fc2dd9edd2c87ceee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute malicious content or conduct phishing. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sportsclinicwest.ie/media/contents/file/zuzogelevufusun.pdf In PDF document text
    • http://szilasfood.hu/pic_upload/files/dotem.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912212230_1165422255.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/loxekelazozepob.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/78553178680.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/matikaboreg.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/5972019372.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/daborelagekiwokadurilen.pdfIn PDF document text
    • http://wenxuezj.com/images/File/9618012624.pdfIn PDF document text
    • https://partetesal.ir/data/file/bikuvud.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/47424176406.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/93304618857.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lijirodadavulozapomatesul.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/pixogaxuwovam.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/96324978140.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/melibakobariwerosarem.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wowet.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/pipumalixuzorude.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/dewuvoxepipamijofeg.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/danabu.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/42880204836.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xulowitutokiwuk.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/fabofubasagape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vegas+crime+simulator+1+mod+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_off0000b1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 15832 bytes
SHA-256: 5d2885d550d9682c4a4b3bc0f790fca377d4bb462965631f10879e65936dc3a0
font_01_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 10964 bytes
SHA-256: fe29b4361e42af038c42fe71f5e57e427112c2934b990036b10ffdc10777e853

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