Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb15617ed3a9bdb4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 13:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 253b082f296b7135c624fb2ff7148f12 SHA-1: b8f6eeef2c98109c3512c57ac7cbf9fb2006843f SHA-256: bb15617ed3a9bdb4aa9404ddd64355cf971d768b5bc629607141c888e1937cb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=nerve+pain+under+arm PDF link annotation
    • http://minhphucvietnam.com/uploads/userfiles/file/72187454966.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/giroxuv.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/97120071882.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/virufow.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143681543225---rovujanegixebijakexeduro.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fawimatarenobexofaxotanup.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/83543435689.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210903_102604.pdfIn PDF document text
    • http://moristas.com/userfiles/files/gaxulalovomesukok.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lutuxagefixujopemuzizowuf.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/52237353633.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/90858864212.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/mexefozemi.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/voxaxivop.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/9819827678.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/62522329810.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c929ee87---70045048263.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/88051517595.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/ludivosolu.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/67241162408.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/47966614863.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/jowixi.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13876851408.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/niludawe.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/mumizeger.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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 16736 bytes
SHA-256: 578993b2a60e876977f86ff4722d261f589b01ce7dc8f811067e0b4aa05cf209
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10264 bytes
SHA-256: 9d054733138fba8e8d89ca8709bf47b0f3c7016c70d46c9d5db883371be016fc

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