Malicious PDF — malware analysis report

Static analysis result for SHA-256 99feb4b6a260cfb3…

MALICIOUS

PDF

78.8 KB Created: 2021-10-15 06:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f40e567ad1be822d83686fd3904e51c5 SHA-1: 4bea41b8e29f917ddec40600d38199cc422778d6 SHA-256: 99feb4b6a260cfb3764662e9e6f3533c1160cf298417cb7aab03b2b0220ac57d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=brussel+sprout+souffle PDF link annotation
    • http://www.heatandgas.com/EditorImages/file/20700180056.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a2mkmpmd27vojt5eo2huiae7q6/kikanopavu.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/55552043408.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/kedesa.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/60967210913.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109230220062224.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/pemuzurakinurirum.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/21729104263.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/23393222306.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/78068584884.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/2920501520.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/49107490865.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/musewazuzinelavij.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/60712888967.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16152774506a5b---zufirutalejubowekevug.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/jufajoz.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/najaropaj.pdfIn PDF document text
    • http://sd-bada.yupucx.com/upFile/file///ITX202110080846393838.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/82790277519.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210911_FEE480CAE3343399.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/nikorowevuf.pdfIn PDF document text
    • https://12shio1.com/contents/files/vovokadowoxafajaga.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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 10148 bytes
SHA-256: ff58b8f0cbea4a9c024727bbce67c8a9ccc813d063e8f2f4534b6fb03ef3bd40
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 18076 bytes
SHA-256: abbfc0521ea869270ff2dcdce7f040034149f623ce11367e2649f883874f2622
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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