Malicious PDF — malware analysis report

Static analysis result for SHA-256 85228f44c397b2ee…

MALICIOUS

PDF

91.0 KB Created: 2021-10-05 00:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9222c16bddd0bb287ecab86ae9215910 SHA-1: 7f5b2a4b46bf1366620083069b5d1c18efc19979 SHA-256: 85228f44c397b2ee6bc456385c2eb81cadfce552021e934d6d1fe9ded5bbf635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of numerous external links align with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.naturhalles.fr/fckeditor/userfiles/file/pepezimizemana.pdf In PDF document text
    • http://fine-trading-knotwork.de/uploads/media/xasidixarigidu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/litogulagixubupepixudigug.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/49981672484.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/lenafed.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/povesilatorapitomofamasu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/taxizixojepeku.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/buzajiwovilisewusovafo.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/venekabumi.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/92249057351.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/7977631834.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xavidiketunigerep.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/39835201704.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/49379542757.pdfIn PDF document text
    • https://unaizahic.com/Files/files/kufisuso.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/91234620820.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/2fa44a.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sogupejigexunije.pdfIn PDF document text
    • https://manenshop.com/upload/files/nujolododuwepu.pdfIn PDF document text
    • http://airmon.hu/images/files/rudejuvoz.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/56190850821.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/65007342200.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xuwakefexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=isometric+exercises+for+gluteal+tendinopathyPDF 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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 20528 bytes
SHA-256: 316cd621eeb92ece7dbbb8dc0e598242d70f5a90007f4b932d33e7a581bba934
font_01_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 11336 bytes
SHA-256: aa42eb1a4e990e4d1d2ad9022b59be4771951bdca98eaa17235264f94bd0f0a2

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