Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5bf2f78b62d299…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 15:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70fb15c63241496872cd5671b626b272 SHA-1: ffd7e7744f0028cb54bdc403ca37d0395ec7ca4c SHA-256: 5a5bf2f78b62d29997402e14187c198586c06961799b7035efeb0d592e0e377d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of many distinct hosts and the use of UTM parameters point towards a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a429ddc570---mopavimof.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3osll3inrmg8s3i3v3cr8nfj2/nonijujoxebiraruwo.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lozivaxexivisofanodek.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/nisodinasuwenanalamupolef.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vuragadijex.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/88428866270.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/94426155037.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/votetoxow.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109151316391459.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210912191032.pdfIn PDF document text
    • http://petrduchek.com/files/jujejepavilapuxum.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/63071193295.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/migurunokevaz.pdfIn PDF document text
    • http://rc-modeller.se/images/file///lutoroxo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/87749843062.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/penifewemonivetowitil.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/90363679911.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/95931064873.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kawusokaxepexigimud.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/57509309032.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/32048017357.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/46555629676.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/1638176435.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • http://poliinc.com/upload/files/zibekilodeloji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=figure+drawing+for+comics+and+graphic+novels+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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 11196 bytes
SHA-256: bc407d7561c551ba2e2f5708902054adaaafcecede8d99b4572d36d3040b5511
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16880 bytes
SHA-256: a4fe466bdb2c0b2a1f172df6df8ee8f7927965a57edb2c1b38d8fb4b8f1d6087
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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