Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a795c10b0badc12…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 84e3bbc76749d7ec5e6b2db3acb43dc3 SHA-1: 9b388d7105dd4685319728aebe1e3c54f18e288a SHA-256: 8a795c10b0badc12a21b43c5c369c38daff131691470b4633524c56043a29b1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://simplehome.ro/ckfinder/userfiles/files/vosufukumuwa.pdf In PDF document text
    • http://studioiulianella.it/userfiles/files/12878144218.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pezowatudileluk.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/9112669552.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/dupazepanerojorapimule.pdfIn PDF document text
    • http://secoinblock.com/upload/files/wodelosatare.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/giradipowujaxo.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/migivujino.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/jemisufijesuruvep.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/68706396514.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/32069795096.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/zusedi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/23845024398.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dd4af90---kidizokiganubodakikig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317df6c62e3---zetexikiroko.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/ponokiter.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/bezexiwikajadizi.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/fetadusotoxuwutazudim.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/96277463570.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/mepotalatubasi.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/27643388934.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenazufebogu.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/97156136475.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/34292251630.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/10417152429.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/pogosuf.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/mujomidurezudinademoruve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+phone+software+updatePDF 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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10716 bytes
SHA-256: 1db8b1338b4e0d67723e8cf870dd2343da8f3de781c7d9edbd46c9678dabee9b
font_02_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 17416 bytes
SHA-256: 4662ed8580c442332b9a3784ac2ac9544ce69cfff2d6527cddc89cc0f801251f