Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ab955f09fc961b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 17:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd4191ffd0facf530d95debe22586bc2 SHA-1: 0dba06f3a3d6f186b2cafdecdc4a4a6bb2d1281f SHA-256: 46ab955f09fc961bd50de909e89260549f41378b8ab55249f7255b875e10981f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of an AcroForm button with an action trigger suggests an attempt to execute code or redirect the user upon interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://infrive.ru/uplcv?utm_term=gta+vc+game+apk PDF link annotation
    • http://dxczx.com/ckfinder/userfiles/files/20210904_234508.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/73421691417.pdfIn PDF document text
    • http://santeh.md/img/files/ririxemurabizinebo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea10ee1b6---63063641860.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/9220937452.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wenewowoxatususejafefivap.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/47859227979.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210917011021.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210902131558_82387094.pdfIn PDF document text
    • http://ellev.fr/upload/files/fibiwumatunupipug.pdfIn PDF document text
    • http://idroter.org/userfiles/files/24533432936.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/65920349333.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/67013828571.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/bubegiva.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29988617775.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/58723048296.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/49704150174.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ditebusawozawefivaka.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/81611384563.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/wixaru.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646375c1e3---megaxote.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/40597255964.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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 17448 bytes
SHA-256: 65eb0ff82b216b1d7492640a4f88f81f5232b315749ed5c065f312b0cb4476e8
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 10284 bytes
SHA-256: 68dc436baf18de017d707aa5f76228196fafdbf2b7bce524b86e18c4fbaabdcf

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