Malicious PDF — malware analysis report

Static analysis result for SHA-256 332c642d1d93811d…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 22:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f125d71b43e70334032672636da0b108 SHA-1: 7395720c1ee995237a1cdca69327576bf724be7d SHA-256: 332c642d1d93811d5f6d6d76a11fd889a0a2f936fb5d5a43cb1fee3fdc8d532b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which are likely part of a link farm designed to obscure the true destination or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nbcmedia.vn/ckfinder/userfiles/files/87177728622.pdf In PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/42347125757.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/31909396126.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/kitufumavedobupemom.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/dimebino.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/ruzekaxuzug.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/2090226667.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/wumemibodudifinetu.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/memaf.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zukizewuj.pdfIn PDF document text
    • http://i-dron.cz/data/file/62300660498.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324482ed11c---41327725181.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/45008987650.pdfIn PDF document text
    • http://ave-france.com/pics/files/bizulelaruwodemej.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/35630136844.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/7364951514.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gimurudezematevejupotediw.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59214691868.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taxelatoloremogimeg.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/tivazuligoroliziro.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613735975baba---dapitebu.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/83754285739.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905044612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kris+aur+shoonya+registan+full+moviePDF 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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 10932 bytes
SHA-256: 5aa39aa3068177f694e63b0c68b30cb0a9010ddb331ee7f72c54113ae59eac56
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 20960 bytes
SHA-256: a7b025cf268d50b3b981ee1d04d56485b22cc7cf0d2bfd13f0de561cabd8d9c0
font_02_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1