Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68c337cd9f4d303…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 06:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66d7531667d550ac9a9bddd7d931dcfd SHA-1: 47386510935da21f32f0b094eebafa3147df45d0 SHA-256: e68c337cd9f4d3037821c45b5dd4bf9699277edb61341042ddbcf40ccf780cf8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a specific heuristic identifying it as a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests a redirection or phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • 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=despues+de+ti+descargar+pdf PDF link annotation
    • http://nitexprofi.cz/userfiles/file/9658920683.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/43991409747.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/bozomemuxalolaz.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/vosatuxozemizak.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/segivixutekuguwewofuxuwap.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/nusasutemumelimipa.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/19969973713.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vojejezobuxedunerevisozaw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3f5b29c6049dbe95e909e43af8a8f0c0/84530186437.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/29870237190.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/27459794842.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/4705391381.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lujizavapos.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/63085942457.pdfIn PDF document text
    • https://asken.as/bilder/file/tolebinukerunebe.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/29910852183.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/98829475575.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/11257641999.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/rebibovimumobunas.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/62638279171.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/13701235924.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/12582797780.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/47452609125.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_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10624 bytes
SHA-256: 319e2213ec8f8470a49f956c0a38e6598e703e07e88b30abf4980474075d5688
font_01_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 21608 bytes
SHA-256: 723474f816a6b99466a3574e6ad2c7aa9a8e2ad1a169484fb8a26c6efcd2c7fb
font_02_sfnt_off00015885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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