Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bebb3623d076063…

MALICIOUS

PDF

68.7 KB Created: 2021-09-20 12:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b54074fa477e95d626a9104346ef771 SHA-1: 69ab3bd66b29de8c11203220408a265dd5080672 SHA-256: 9bebb3623d0760639c6dd5227148ed6f7ff18bbba52bfa91e0265e26585fd9dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of many URLs suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=talking+gina+the+giraffe+for+android PDF link annotation
    • https://eseninternational.com/uploads/files/72679728572.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/44043361452.pdfIn PDF document text
    • https://steammining.com/userfiles/file/kuwasalifitukinotuviwumi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ab99cc2d---85521038815.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mubevitapud.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/34105142448.pdfIn PDF document text
    • https://emprenderem.cl/files/71688726637.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/37552467340.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/loxija.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/1490604596.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/zuvoxojipuderinuxodub.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/modanajotop.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/sefivadegan.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416cd87e28---remojasanetav.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/xinadad.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fanutudel.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lizujusinevorenamikoneni.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pivejibimasew.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/jonewirojugogaromig.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/17565868769.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gipuromuforitalezasa.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/2094030984.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/gusow.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_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 15236 bytes
SHA-256: d947c94a5cccf6d8b838f4b0b1ad99c3d6cd7125a7dee1b9a1e41f9b0b6520bf
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 10520 bytes
SHA-256: 16421214227765dd7d386d882d5b8e17eec061e8ad50d3b37b6352be5e90439c

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