Malicious PDF — malware analysis report

Static analysis result for SHA-256 c236ad7f32d4f7d4…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 21:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d7ccf655cd5fe82bc6b5e5306b7a5b SHA-1: c48b4884184043a5ebfb5d24015c497fd34c6af1 SHA-256: c236ad7f32d4f7d4cbf9b271c5ea1132b61ce25166cad44cce67484e8a078420
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple external URLs were extracted, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://coretry.ru/uplcv?utm_term=lower+chest+workout PDF link annotation
    • http://grandwatergatehotel.com/upfile_hotel/files/sitiranagopiguj.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/gevupinun.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/denomitogatina.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/60489760374.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/48599181128.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/gazikozagumuborejejisixin.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1ufqq0516d1l06rouc7vclu5im/lanuruzi.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/zudezutotogot.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/xusijevire.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/sikekederunuburuziw.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/85712931726.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/15422890898.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614727a4a3eea---68546522420.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/zidasawon.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/vokibelilupog.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/97521266140.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/36909506669.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/40228612194.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/tirudovomoziru.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/66863025749.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///80767565823.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/50259921305.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/gimigubiwomadetum.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/21436270967.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/gubupijowupowon.pdfIn PDF document text
    • 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_off0000b0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D2 14640 bytes
SHA-256: 9366b0df83ed77010e8155c563a61784750d1e9c7c8333512c2911b4a4acef22
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10156 bytes
SHA-256: d7480b91595c5a236c05faf8dd7585f601bf3ab17a0c7445b1af9f42578a7782
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1