Malicious PDF — malware analysis report

Static analysis result for SHA-256 6416fbb99a5d4812…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 03:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e03beaf735d9f0133ee67dbe14f8a088 SHA-1: 86316db17bf8f396fab83b6af4f83e868b6f0ce4 SHA-256: 6416fbb99a5d4812022266d1481c151711cd004e4469e16fbc0771d248eda401
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links to disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass security scanning. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/37973527820.pdf In PDF document text
    • http://hzzxtl.com/UploadFile/file/20210909013133417.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/rulovetukidelizejek.pdfIn PDF document text
    • http://lachina.cn/upload/file/89363392370.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111029325180.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/80456289999.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/xanavopitekikepaweweg.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/poravuwuzizitaxelajed.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/sosow.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/49897478955.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/84598985949.pdfIn PDF document text
    • http://kag.fr/userfiles/file/gokagugufusibelek.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/67313504400.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/tadabirumipitikulepeli.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/59881897973.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911120334578442.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21222048895.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/1592601605.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/bukodaduf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/liwesikosasabomumetek.pdfIn PDF document text
    • http://gespk.com/userfiles/file/44595084891.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xajobulofozuwavibexolapap.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/nikokopilavenolusid.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210917185531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=after+5+anna+todd+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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 18744 bytes
SHA-256: 5d067ff417cc098a09a6c268d534970111d7927534d8c3a90079ee5509c4f8c4
font_01_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10300 bytes
SHA-256: 5e5032a0a52a7d1d9e9c48095d3992caf488e8849e5817c65a343c1a366d2d64
font_02_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1