Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71f8b5ff16ffb73…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 22:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffdd91606ba2e448f0490fa57e489c17 SHA-1: d5d7c2ec8e74b932584a6b55aa3e7717065dba09 SHA-256: d71f8b5ff16ffb73cea9b87d1a5ce66588c10a85c1f952adeeb018022a98825d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://terredellamagnagrecia.com/userfiles/files/85072864610.pdf In PDF document text
    • http://indexone.ru/upload/file/bufusutumidenoxafar.pdfIn PDF document text
    • http://computerdoki.hu/user/file/rizadifujevutal.pdfIn PDF document text
    • https://pecintajp.com/contents/files/kejut.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/fisunulexizepegol.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vekigenidiwulokimafag.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/tegateke.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/18500567130.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/nifatanulogop.pdfIn PDF document text
    • http://showdoimovel.com/files/files/butodojulo.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/52378960785.pdfIn PDF document text
    • https://path.mn/userfiles/files/58163343088.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/wetigofafanazibejak.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wijolofir.pdfIn PDF document text
    • http://e-district.org/userfiles/file/11908030912.pdfIn PDF document text
    • https://iohrp.org/f_files/files/revagufuxuwokumiwibasol.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18b21e8d2---77632967419.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e8mq0nd75j4c5hsf0ib4jherbp/rijug.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/90034622331.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/zezagerozimuloxemeb.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/17145926252.pdfIn PDF document text
    • http://riversedgefm.com/files/file/viruzogoxagidoradeputepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+cvc+reading+comprehension+worksheets+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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 11240 bytes
SHA-256: 362a2e497e3a54fc553963940de05b6caa4284d8110277321578f5788c155c2a
font_01_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 18776 bytes
SHA-256: e08e4da7ffa2621176c85a5e468714a0fa46e8c233fc3a38af325c21039acc86
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.