Malicious PDF — malware analysis report

Static analysis result for SHA-256 505655008bbeb61a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 12:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ad6a7f6083610f144f050e60e71fa07 SHA-1: 2e5f887e4d174331c0073cc32a10109cb920d068 SHA-256: 505655008bbeb61ae8daf161b7c4b404256984899f92439604674ec48d92e6da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://longthinhphat.net/uploads/files/junozapufipewuwus.pdf In PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109042223387066.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/pugubabokojalazof.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kuliwakipuz.pdfIn PDF document text
    • http://symbolfoods.com/files/file///69107887519.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/midejawororan.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/xomin.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/71000711609.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/21535233539.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/71655737842.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/sigemepolopow.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/41669033406.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/50834415593.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/mafiganafobegigeduveboz.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kanugutatuxafejurolerun.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/xubenesigegupalirexoz.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396d1300c37---pefezu.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_005156.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/99334144140.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xegumafiwopekix.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/72964247042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+phone+as+external+monitorPDF 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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10796 bytes
SHA-256: c04d6d626ec295051b8fb97aeaa95db7563bdf0a48ec9c129672c9dcd743d2c8
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 17580 bytes
SHA-256: 8c5868fd9a7fd67fbc454a227b9112a69b988294031d730d0893a640b466e334
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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