Malicious PDF — malware analysis report

Static analysis result for SHA-256 650b2cdcf488d018…

MALICIOUS

PDF

89.7 KB Created: 2021-09-21 01:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb864522238c7b1623bb3f7ae558bb4a SHA-1: b84a93b1eb6706c04020cb8a6082b3827e512532 SHA-256: 650b2cdcf488d018dbed6998fef5d9f889ac666acdb45f0adeea06e19e7d8996
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://synerhu.ru/uplcv?utm_term=best+android+games+of+all+time+list PDF link annotation
    • http://dekogard.net/deko/veri/_files/20413503501.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/widaribe.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/bikodudetivirabokitevar.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36127200671.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/tubisinotor.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/ruvunifekisijefoze.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zerazitosol.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rubupudimi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/71806978374.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/fizamibusijago.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/85248625678.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/16382435401.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/57778812056.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pifunowi.pdfIn PDF document text
    • http://boldogelet.hu/media/wudev.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/16327815851.pdfIn PDF document text
    • http://citra.cl/userfiles/file/jolukisuvebiputoladexoki.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/61782861867.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/jefidiratinuliri.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8aa48eac5f357bd8d6a7ecd3ee57cfc1/53897806004.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/mezaferegizapotifufajer.pdfIn PDF document text
    • http://th-hl.com///upload/files/70457106020.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/57109883353.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/juwafopaxesobisilokexig.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/aaf693d8871a45de36f39126747c3f81/noguzelapajamet.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_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 10752 bytes
SHA-256: c99e1c105f1bb4d68e71f4f1c19d6b0ca5284546c69bac90bb3cd6d58dacc4e1
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 18776 bytes
SHA-256: 0982c9b48e629efb03c0229daa8bb953adea5408b4e431befa7fcbcfeb2256a1

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