Malicious PDF — malware analysis report

Static analysis result for SHA-256 116e6dd34c4f6a58…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 01:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61192472d21fab847af562c8fc5cd1b0 SHA-1: 006599002b3f60272778779dfdef6cf9f5626dfe SHA-256: 116e6dd34c4f6a58c8b2c66bbaab504008be8d1a013238f7421fbc5b58127dca
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a tactic to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure suggests a malicious document intended to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maxlinder.com/admin/assets/ckfinder/userfiles/files/voxataderub.pdf In PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38813493450.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/43225470610.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/7687915410.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/reromus.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/85459150613.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/46320267081.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/powilesowarekovanefopew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33edf77969edb26a14ee5ed658b6db52/57615826115.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/bonusitafimifafodafelorip.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/12176267541.pdfIn PDF document text
    • https://rm-parketi.si/uploads/7771687746.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/84378043293.pdfIn PDF document text
    • http://toroisg.com/public/images/files/10420275552.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51309713034.pdfIn PDF document text
    • http://potya.com/76160335426.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109081550268077.pdfIn PDF document text
    • http://geraldinekilkelly.ie/90208304995.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/viruxuzabi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/bawajigijadarezusuwim.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec83789f5---viwunotul.pdfIn PDF document text
    • http://huiking.cn/uploads/file/162229057521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+add+widgets+to+your+lock+screenPDF link annotation
    • 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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 16796 bytes
SHA-256: 56d091fb708d3f0923f788ab7181f3ed54d3521774d46b28739ac72fd17c561e
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 10928 bytes
SHA-256: c7de55aa7cede9fe7f1e3af1e64269555c6dace9f110e09918e1a6c236a858f6
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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