Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2d9f9b0832555b…

MALICIOUS

PDF

145.1 KB Created: 2021-10-09 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: acb7ebca4933413113d867ea86f0abf7 SHA-1: 6c640b70ff9b069ac9abac1a8e5cf897c8c20ae7 SHA-256: 4f2d9f9b0832555bca1edd11add99627026e52177e4cd44a8069dfefb7265b69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://recrut.com/files/files/28875564558.pdf In PDF document text
    • http://spharma.ua/files/file/56666439899.pdfIn PDF document text
    • https://dafelia.com/files/pumawub.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/6176376872.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tusigabejuwivuv.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/murif.pdfIn PDF document text
    • https://ckmandarin.com/uploads/98777843728.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/35ffe5798f10526af6f4189a9d3b4f6a/16551311275.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pitokifeniluzo.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/67282862535.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/mowexuketot.pdfIn PDF document text
    • http://sushi-belovo.ru/files/36448645460.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/95994730874.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/69123588858.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/95523446156.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/zipamabibosofosupevu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/85361826107.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/77125868312.pdfIn PDF document text
    • https://fultoys.com/userfiles/76990784542.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sejirozawimijulofit.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/62003f0a4e25cc40986a77c29ee62a4e/26602189058.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/60132226099.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-18/20210918180012937186.pdfIn PDF document text
    • http://gewald.ru/content/Files/15883577341.pdfIn PDF document text
    • http://zl369.net/userfiles/file/48969534657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=brian+rose+archaeologyPDF 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_off0001cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB66 10576 bytes
SHA-256: 2d358f7ab50cba3f96e151e7ad22616bcc328e50dd40e90d9abe36e49ce40daf
font_01_sfnt_off0001e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E378 22056 bytes
SHA-256: 97a2d4b8b461310ecad6456a7775dfdd8eb2078dcbe1b2f0783f264a645a5f1f
font_02_sfnt_off00021c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1