Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5c10c0fdab1bc8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 03:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 811ff333283aca82dd7f46a939a4cf62 SHA-1: 4c31b46213061ef6366a53ee112c13948023ac06 SHA-256: 9e5c10c0fdab1bc8e973dbd0ec932e8648e4909843d3d543ec07befffae779ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to potentially disposable domains, suggest a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cncunse.com/d/files/kopavisuvatufa.pdf In PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/kobekenameterajewe.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/25318247178.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/sasikudukorazok.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/dulopumufogedomaro.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/67441599172.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/voxine.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/pemadamedip.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/lexipekawuronu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/12212273156.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a909d0c5e---60123511923.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mibisiriwasiwopagiju.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xijovavom.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/55627391724.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/56513341581.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/10901357328.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/15095657695.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/mokunufusasido.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/86294558568.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/berupapegeviwenezurapel.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/96912814048.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/94121352317.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tufoxizoma.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2c7aefb4216b3a24e83ab152533b6007/26826239945.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/65473136164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=system+launcher+keeps+stopping+miPDF 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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 18720 bytes
SHA-256: 8aa73fccba0da353e6638710ac736a1f3b00dc67a1d9921df8bb75307b5acb12
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 11204 bytes
SHA-256: 479fb7dc25d9e86d040f95d2ac562f385ad79061f4c98e6459ec516c0cb2ebdf