Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd76d2faefd4db32…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 11:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 807be08c003875b5ddb612e72c4240b1 SHA-1: 5ee0a8a2f2bbb3f372ea3f8b5fdbd93c017ef6ff SHA-256: fd76d2faefd4db329b8d76d3ea8ffe5fa05243da1351b312a6d9048fc84b17c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded, suggesting an attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.miyadenthai.com/image/upload/File/11051921606.pdf In PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/lilikolipuropinuxegune.pdfIn PDF document text
    • https://777mto.com/contents/files/zobupusopotex.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/82124436883.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/3468715642.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/rujinujegonewuzizosezax.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/27319870526.pdfIn PDF document text
    • https://masukpt1.com/contents/files/xozotefebevesatigagosa.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/tamez.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pabuko.pdfIn PDF document text
    • http://oodow.cn/upload/file/210906021413029750ab4l3krgny1w.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/wumekuwowupepovisakometo.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/46377534902.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/47660307915.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/72947827943.pdfIn PDF document text
    • https://avenue102.com/uploads/file/81798965242.pdfIn PDF document text
    • http://vhz.cz/user-files/rifizewokexem.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/60658776985.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/denemaxefotesomiwokadevut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=scary+teacher+new+update+downloadPDF 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_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 10724 bytes
SHA-256: 5104688f95c8075bd1bf97a1d5a98643661ea8b9af035f6cb53b03198b028e61
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 18640 bytes
SHA-256: 0976180303d20820239b95b2e9498452a56611b486a6a836c721de68d4e4a810
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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