Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d27b4a71414ed4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 19:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4edadfa98d78cbc572a2890bd18335fb SHA-1: 00fc49fb7dc76c67652193a656bbf98fc567be0a SHA-256: a6d27b4a71414ed4ee767fbd256162dd91f3d00bb589e4e403f01b21a78dbc5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thehouseproduction.net/file/1911976578.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/jinizisijumowunaxovof.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zetigelawigur.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/20329075491.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/fesofofujijakubowomen.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/13490870777.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/tikolezavelisowetakuvoru.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/2632472255.pdfIn PDF document text
    • http://gibisch.org/files/files/83087535522.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/69591488693.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/54960178720.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24577844828.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/29110343630.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/nilawepedop.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/dukefis.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/mipubojiwewekida.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/torat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=head+soccer+apk+unlimited+moneyPDF 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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 10972 bytes
SHA-256: 468fd27ad927f466abe3106245950942a0208e4cab5bf00f6b1603e70f088b5b
font_01_sfnt_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 17716 bytes
SHA-256: ff0221f303e56c923e3dc6422b60cb8f67e338d9e4fce553d6a3bf163de799aa

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