Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba53ffe457ea6435…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 11:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fc5b90a438e75f890e8c4f3df45044a SHA-1: 777aa346c1d386df3b9489ef5632cac02c51d588 SHA-256: ba53ffe457ea64352c14aad39ddf5aa606cbb39b7f553d656a9f9c71092ff8f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates potential for malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://lederstuhlshop.de/ckfinder/userfiles/files/59249046403.pdf In PDF document text
    • http://physio-praxismitte.de/userfiles/sirugugenaxojopajol.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/84000253879.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/7054839876.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/guxoworakoget.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/28633330483.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wiropiseguz.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tazedug.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_040037.pdfIn PDF document text
    • http://licausi.it/userfiles/files/5794015661.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71893995609.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/12202574993.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/noferoviligawajadufiru.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b642d02bae905d1920b756dfe59ebdd0/43577000712.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kidaxotusuga.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/pizumepabesolofe.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/pokenikume.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/pufesimekip.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/fojararurusiniz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fdf5d35321fd251a39d3ae5c43f82ddf/lefazogujixag.pdfIn PDF document text
    • http://hbaoge.com/upload/files/61238460040.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogot.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/69284564924.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fifafinaroxugibirufexinid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+chrome+for+android+10PDF 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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 19368 bytes
SHA-256: fb5e74c05f7a519862c495c6adf6d26d7694826ca16855e74b710e5201662ee7
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10736 bytes
SHA-256: e46fc3a27dd6d798abfd489c4f7154a5e0724e4fb359c6d779af217b3056b954