Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c95ad4aafb64e6b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 05:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8abc37a5aca20aabe1a1fe2ba48d807 SHA-1: 705c3ae5c9b90569d903a4ef9c972ffef0783402 SHA-256: 9c95ad4aafb64e6ba14953be64495c9d94765239f7c150091e7fe3a2c36ffa63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://boracayg.com/FileData/ckfinder/files/20210905_209CECA21FC4E6E2.pdf In PDF document text
    • http://mertcelikkapi.com/userfiles/file/53678425072.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/30873017034.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/73508109440.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80924440539.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kuzobebumomakifuweberu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/zaxasifokesug.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xotirolubew.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/bexizepa.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///rasudufuwoli.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/nifazuxexexakawa.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/wutijatulopusobu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905135431.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c226f32c---basumidatosaxipusex.pdfIn PDF document text
    • https://rintrans.com/files/xifogobifutujomakeduxaku.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/pozedopotif.pdfIn PDF document text
    • http://splogservice.ru/content/file/kegepunalutipiwur.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vikininejukasajufox.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/29803902222.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19311928810.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68158123481.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vkiniknmqor6uf92mujrdqfg92/puzitugeramuwerox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mini+militia+hotspot+connect+game+downloadPDF 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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 18164 bytes
SHA-256: f2cf287e6ff4e39cf85838452eb8c997ca153123c4b2a31d172ebd3610403874
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10940 bytes
SHA-256: 2098d6c0e31aa4344de0b0d001cc38f3772b66316f90d578b68ea1807992706d