Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce51c7f112a8da6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 09:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d57da4db9b6b20a738a97b44dab01ae8 SHA-1: 0b4a8ad865782cef374623aa24f075e4a87be582 SHA-256: cce51c7f112a8da64da1b9577fd16b64ff589b4d68f23ea974fabc5b25b1c880
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many pointing to disposable domains, suggesting a phishing or spam campaign. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. The embedded JavaScript likely serves to download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/13503356433.pdf In PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/7043573311.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/werogejabujepirupe.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/34766792441.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/ponisidozelazulo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pafukulasux.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/77562916989.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/nazivusupoki.pdfIn PDF document text
    • http://apothepharma.com/upload/files/tivozojeguj.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zegexivuradigi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/11121142212.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/7434460818.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/31753306352.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/47492609408.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kowefunowujogozasago.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/52541919414.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4c301ed6.pdfIn PDF document text
    • http://labradory.pl/file/motelikisutinibewetelo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/15852774653.pdfIn PDF document text
    • https://matratva.in/userfiles/file/68395626623.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/12771591224.pdfIn PDF document text
    • http://alvitraders.com/files/waripikizozivubomukawi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/46941957897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ispoofer+pokemon+go+android+apkPDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 17540 bytes
SHA-256: d6eae1112176dbf351243d15657d9bf77a0f97d54074f5bfd9ff781076595522
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10740 bytes
SHA-256: 521bdb9db37e1f3f890baa5e999492b96ff8ef8ce7fc0739e2b02d0e43608e3e
font_02_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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