Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78fe4faaba1d491…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 18:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77dcee37b53c7a62658acfc876ecb071 SHA-1: a232d88dcab71e446efe1f98747b4c481e91235f SHA-256: d78fe4faaba1d491e91c325b5fa572c3b858b5e2d17e2200c1a7ad15f717f306
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=properties+of+acids+and+bases+class+10 PDF link annotation
    • https://hexema.com/FCKeditor/file/11637103461.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614719ca74f0e---81327928606.pdfIn PDF document text
    • https://iohrp.org/f_files/files/77399427404.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rsb4vud069sold3ld711didd4o5nfgvn/rujasevepix.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/pixomegekoposokasi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/49572138587.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/9249699469.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/zabazimipigenosazifelozo.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/zepevu.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/barozovodugizivafude.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/xalokovepakikumepa.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/89810017715.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/10508933519.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109032224522228.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/94098982232.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/14003794907.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109280301505314.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rotujajezo.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/26701724577.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/93268366837.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/kalidusofixadufug.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_off0000af4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4F 16332 bytes
SHA-256: e84786b354468691cf4321ef4f2dfbda3b2a854e8be1cfd70749d9aed269e74a
font_01_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10928 bytes
SHA-256: 180934eaf2d6e2ec3b97a2de3fbe45a9c4a671c51975e812c48e441ce96746d4
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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