Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed2b6b96b6fda90…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 21:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b42694a39602484a968c94d9f7103369 SHA-1: 916724d1ee9038a091c7b14bff4d307bf9782988 SHA-256: 3ed2b6b96b6fda909fac371b8290fac187afe445728164132c53e8310b6bb64f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pastijptoto.com/contents/files/59114343277.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///60877241358.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///9697819447.pdfIn PDF document text
    • http://rayer.cn/d/files/muvapumobemulop.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/rejujamilesodip.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/446181564.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/59826739851.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wopikakoxesepudoxujibu.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/39139256378.pdfIn PDF document text
    • http://belovosushi.ru/files/89272002595.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/48095229005.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/dejoponetovagirusa.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210915202049.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432c7c10ec3---3330383322.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/60396713356.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/moselo.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/20020603739.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/gobolad.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/52680138172.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/47687131042.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/vazufasovugupabi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/tosida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=imotion+for+androidPDF 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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 17220 bytes
SHA-256: c18471823f1eaa06dcfe5424da69ecd55bdf510ad0b2679dac814ecfcb4e3cf7
font_01_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 10120 bytes
SHA-256: 31b744ba7e0c740904a0fa427c8c1cc2a8ba105760f98c46adf1269dc38906ee
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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