Malicious PDF — malware analysis report

Static analysis result for SHA-256 783a36fbb448857a…

MALICIOUS

PDF

69.0 KB Created: 2021-10-08 05:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37f435068f0f97c6c762f2e63c5e1458 SHA-1: 507789d73313861f2fcf541571e788b06654e00d SHA-256: 783a36fbb448857adcc2f5f2c2917661df0dafc2b588bfb9fb00b1719390984d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://nomylo.ru/uplcv?utm_term=adversary+meaning+in+tamil PDF link annotation
    • https://beautydent.hu/editor_up/60055387581.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/81691021210.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/65213355858.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109302210392163.pdfIn PDF document text
    • https://istanajp2.com/contents/files/16681888208.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/rarabokixokisopo.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/soges.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/99246873049.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9f262be6---rarajupipurimidafinoj.pdfIn PDF document text
    • http://alltechsro.cz/files/47236749648.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/57448468301.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/nanuzunixo.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/vebipizulazoropu.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/kinajedemufajusofazagide.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/11916808622.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fetalologem.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/19966472642.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2e567e24e955d8dd1e942573aff0543e/valukufivol.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/saluk.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/xonafumufepajigel.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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 16320 bytes
SHA-256: 8fbef35295b63f9a14fd1f32687d3a9e5c3116c9a5e76cf545f95d55d8e0d16a
font_02_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 10632 bytes
SHA-256: 0b79dfca6a57b1e94c8285321ed64e69835022d800a5363fd2e5d12bc5132d48

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