Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4b7dec6fd62e89…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 21:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 445b3eb0c58958f3ebdced622f72f6b5 SHA-1: 4961e107c15c484333627a3ba86b079cd9aef4b9 SHA-256: 6d4b7dec6fd62e898becfe63eff26e1988de0f197008d32001c575517fce630d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is used to host a large number of links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://a2hgghk.handylover.com/upload/files/4985680789.pdf In PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gutimavuzasumovonuvok.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109241337347849.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ripifotigujijorolusevi.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109230203272938.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/difemosinalik.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/1453690988.pdfIn PDF document text
    • http://mosjob.ru/images/file/serakupufa.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/1401359742.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/livomuxutadofug.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/11976144453.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/dapamuvutukipuden.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/58844195527.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/kusema.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lt5urnojn4et21enh4hivs7535/81200123071.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b131409ff3---jubizakixuxenutonasamu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dabiton.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/rifawaxage.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/20837998767.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xowinifab.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/31539200957.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tibudemisomasisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=disappointment+with+god+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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 14452 bytes
SHA-256: 4b7a00ac9f76eb9d40151109c4253f79e83d43a351051c127443598fafa138cd
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10884 bytes
SHA-256: 42ea824a1dad6153c7b7ea7250d9105ec76f48c384e058c9ac1cff791fd7de2b
font_02_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1