Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cd550ee9d2183e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 02:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92fa7166a48412a8580057039b842d1d SHA-1: 78ae309b8959151427fb39c5bf1f482c2dec3590 SHA-256: 83cd550ee9d2183e0c0f06a4c71676885fe55538cd5cc983858aad2d35de253c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a link farm on disposable hosting, with numerous unknown URLs pointing to PDF files, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hausbaumesse.at/ckfinder/userfiles/files/33655741401.pdf In PDF document text
    • http://greenld.com/userfiles/susolagozijupomipoka.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gusujisazaz.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/lusaze.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/doxovo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa096dc136---25210714899.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210919_CC95D40AAD67CD22.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/nonepixojadol.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/28886991866.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/9897180113.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/14292431676.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb9a34116a---57127461612.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/worubidojavopudezugutum.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/21099130279.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lefukojupiloxezujo.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/34122761090.pdfIn PDF document text
    • https://iohrp.org/f_files/files/48192663056.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/66803088155.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/62417058226.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/22557570118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pick+image+from+gallery+in+androidPDF 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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 17764 bytes
SHA-256: cb3b818985f50aa7ee633c363806892512e09cb5503214874c13464f51c3d1c3
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 11080 bytes
SHA-256: 72eeb749836dfdea1fd95a4ded0d1ffd6832a1eae4945efec26c7ad148ea0aa5

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