Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d06139f74a4041…

MALICIOUS

PDF

72.8 KB Created: 2021-10-04 18:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 43da1daa73d29a8bd5f4808fdf41e499 SHA-1: 4df1e819323a04479d68b281b77773282be5b3e9 SHA-256: 55d06139f74a4041d1bf6c8b751f6ccd2d82f59963b313141201f3c053c81e5f
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 numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=operations+on+polynomial+functions PDF link annotation
    • http://istihdamhaberleri.com/upload/ckfinder/files/jipuju.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/16120968103.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/fazamebaweguporudoni.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kadapezewili.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/328465782.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sivuretusuniv.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/daximafof.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/71800564299.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/33563041203.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/gejewunizabaxurovujaros.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210920070111_pvkpfz.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pajolamobuxubi.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/18189630600.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44460144963.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/nevakesudaveb.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/95ef1fb76b5a4ad4afdf0408eb39bdb9/33553213041.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ruridevotet.pdfIn PDF document text
    • https://12waktu.com/contents/files/46941801751.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/11219136583.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/89676017599.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/defitutukep.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/1590888033.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gufonosonulafusejizigoz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/44781297549.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nojimujefujonipumegazib.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_off0000be2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10880 bytes
SHA-256: f119a37080e18c71b130df239a1f90bff4ae5df43d8b902f4eb783483fd8d7fd
font_02_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 15200 bytes
SHA-256: c18a7fa24ce36b8381ecdd559aa7a5b8ec50d909bd916344cf29d87c02ba8f66

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