Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e5f85b9e75b7c4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 16:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5fed615e654777ec87fdb4e48e007f35 SHA-1: f4734baabd2ef242200fb7c13f97caf136285eb9 SHA-256: 48e5f85b9e75b7c41686c4991ada6bfce21769a83b219633b4ffd1cabc0b5725
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and the presence of external URIs strongly suggest it's used as a lure, likely delivered via spearphishing, to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=baofeng+uv-5re+manual+programming PDF link annotation
    • http://cristal-in.fr/userfiles/file/vodalel.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/4094675148.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/dinavutal.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/19704335837.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/sakexuwuzim.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/pesokulu.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/divibuguxurarenonutor.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906080628.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/86475289584.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/90087724563.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/22931779385.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/20804031572.pdfIn PDF document text
    • https://austarpharma.com/upload/files/momotibixofatono.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/renefiwuf.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/jujifarebabilesulopumime.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/19372128741.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/91467813562.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090706095380740.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/jarig.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/saduzemavixilasor.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/42769929002.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/bufexulepepalijiw.pdfIn PDF document text
    • 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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 16640 bytes
SHA-256: 6e7825cdf1eda49b637480e5311baf36c284952b26eaa81bdf5c2fbddb32e666
font_02_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10824 bytes
SHA-256: a0cefd1a1ae0b468d0305022d8b68ebf9ef222cad251d732ad038ebf7993e3b8

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