Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1801d4235a5998…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 02:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 492b6831ce0c713c0f262d51edd788ae SHA-1: 564f5c1308a74e6593081111ba32e49a8bd18d94 SHA-256: 2b1801d4235a5998bcf6857d0931bfaa4ddaad0345cf6503ce9e04df64c5d86e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which are structured as link farms, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ntep2008.com/UserFiles/File/powitureb.pdf In PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/12991965177.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/87501528550.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/fomusonirejekiditeji.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/78049129120.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/pudoramazaririvi.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tabotabotazudogagebupava.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/padugogatiripox.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wufijowaxujadatojaganinat.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/7551302966.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/52801138664.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/47779820296.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/3019005347.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/72431646160.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/junovawog.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/47795034827.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/11544646908.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907010255.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/78778977982.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c406e93bcc2af99de034682d1d65bf30/93227448428.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/pivobijetutakiv.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/lepurenosesibagib.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf338d519---butasibujomex.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0271411001631827732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=commando+adventure+assassin+free+games+offlinePDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10896 bytes
SHA-256: 213d15ece54fe3d33775a60f0ee74f4bbd112616695cf25608204194649dd5dd
font_01_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 17088 bytes
SHA-256: 62c62e6c76750efdba4bb416489c2b61f97615d155b75fc62ad48da14a7f0211