Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77e7b38f0a13ae0…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 06:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0036b06c9ff93fb4fec24ab75ed3d586 SHA-1: 7f67e7b161669da8a281ec9f22f3133c906ef8e7 SHA-256: d77e7b38f0a13ae03d9701c4638e24c6d63b4c110f90f7a67dd2ca4a4db87753
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aristi-trap.com/upload/users/files/segudunavatigosi.pdf In PDF document text
    • http://mhzsolutionz.com/userfiles/file/wipuz.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632203677.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/wozoda.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/71337526496.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/25286718341.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekowowareneveg.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb4765872---17974051379.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/78639283376.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/6501974529.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tavapemiw.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/5803037019.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/44258801559.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/47716879608.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/dabaxo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8leo5go4of1k4rci939rbavfg1/wulug.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/39089049800.pdfIn PDF document text
    • http://espokebar.com/uploads/files/1017775894.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/53655909484.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/naponokazab.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/64389451624.pdfIn PDF document text
    • http://wixoon.hu/upload/file/riruvapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hill+climb+2+hack+versionPDF 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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16188 bytes
SHA-256: ba9464e5e99778f77323ca37b1bdb4c5a1423fdce8f50eaa38a62f99ebfc4522
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 10808 bytes
SHA-256: c17c2672936b00b27ecd2d29c437fc304d4d2e7928d2de7e053c20be4b3bc24c
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1