Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32d5ba35c750ed4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 19:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c6fd74d9b6eed56e29d6e98ef7b70b2 SHA-1: 156796b94e00d8a1f9be2b90b5b3bd8e7d6e8554 SHA-256: e32d5ba35c750ed4c415f8e727a8ebe6b5a7ee5a2d9ad9c895edf4d497dae72f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a link farm heuristic further supports the attack pattern of luring users to potentially harmful sites.

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 http://classiccar-jp.com/js/upload/files/97459966470.pdf In PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/44162524403.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/misilijutafewijawedena.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/64940850149.pdfIn PDF document text
    • http://sswjeans.com/files/43824363002.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/8125434687.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210905140210430.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/48314687085.pdfIn PDF document text
    • http://bienbao.net/uploads/files/virosinepivonanukuba.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/17687944546.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/62373649208.pdfIn PDF document text
    • https://membermimpi.com/contents/files/xenipupopi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xelikedugal.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75369276629.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/karixoj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135407541a5c---42005344647.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/tirukum.pdfIn PDF document text
    • http://peoplefoster.com/pliki/60965183364.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/587craq4bnk4a81suum2qtnbch/toxowijesujafalabexexoko.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/46236994736.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906065412.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/regorimugezit.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/butemebupapet.pdfIn PDF document text
    • http://yilip.net/userData/board/file/meluxuxilelatomimafed.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gopemujurumo.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/boxunukej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=samurai+vengeance+apkPDF 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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10616 bytes
SHA-256: da959ccd5ee670bee069c5e55e3ed88ca4e3baf12cabd904366da4acda97b500
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 22908 bytes
SHA-256: f9b44328d7a7525bb5283be46f1b91cfd887c09ef7286910aa514fce9b070e25
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1