Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4950669b8749c2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 17:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6a17a5bae46adf9e93eb55e7535a0ee SHA-1: 0803585d88895c9e62afb91410c4fbbf17b3dee6 SHA-256: ea4950669b8749c24047a01d7f27655e4e8df281fb9bccff437d9c70d07fcdc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, indicating a high likelihood of phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://sskundal.com/userfiles/file/disovobo.pdf In PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/pesuzugejulide.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/kiniveganirowekobi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5t4t85sndn2sap29sdqfbspdig/bubaposotegebafawu.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/49466660801.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/48241515634.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/misamorinawego.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/17653363136.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/punaxezokimijelim.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/dotasirolat.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/78066991244.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ced2c49500---32841334912.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/86640527268.pdfIn PDF document text
    • http://cocoal.com/uploads/file/87894174715.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/30023125860.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/36180086781.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/powodiseniwufinimi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109032231095497.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/felubi.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/dibifipamovivuxag.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/52911012162.pdfIn PDF document text
    • http://capital96.com/userfiles/file/24888068534.pdfIn PDF document text
    • https://adikketiga.com/contents/files/44240774412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+go+samsung+galaxy+version+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_off0000b086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10972 bytes
SHA-256: 5a0c0a3529b41f5c35a7f9a455df44ccc830daa0106c0948bfa7c0feb5a7e7a8
font_02_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 14616 bytes
SHA-256: fabad4603d6822a06cf13cd5e7fe16790e8e3b0aed0bbb559916b3786d6f9c1e