Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69a193bc7cb6a11…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 20:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93c5e448ece0e23730d39d9a1485a555 SHA-1: b1c0f4f57ed833fae983c39ea0c9728d7fba9919 SHA-256: f69a193bc7cb6a1128198de1140998f2f6af5ab8a1a5032ae2503f85261c5d2f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format and embedded URLs are commonly used for delivering malicious content or redirecting users to exploit kits.

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://medvor.ru/uplcv?utm_term=app+drawer+settings PDF link annotation
    • http://ordinate-ltd.com/file_media/file_image/file/75410379486.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/jopokunu.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/39309572851.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/xaderonefaxoki.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/34065420547.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/84596224016.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210904155821.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/3693249023.pdfIn PDF document text
    • https://bak.vn/upload/files/ligitepapulisovisazetuso.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/finefurepini.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/93568822490.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/62012268187.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/24095387168.pdfIn PDF document text
    • https://tele-video.ru/upload/files/damatanosil.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2fgie761533gq2uffjem8p43ug/90758210248.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xexililavufopinatunopevi.pdfIn PDF document text
    • http://dalaichau.com/files/zefexu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/nefimukawupesa.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96256791142.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ronavaza.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/23064021779.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/49010031276.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/87157710045.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210901225820.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_off0000bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA4 10468 bytes
SHA-256: 2e67a6d3483c9392bc324b2a7b3f41feec0622c5797b5eb7c0fa8f9dc76f19a4
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 17384 bytes
SHA-256: f41e7058e7d6fd42badbfe80b1fabb7edd536d57409394f69b3cb8a9336db70a
font_02_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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