Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac09fb652eb0e101…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54df8611714b9ddb263edee474b2e7ce SHA-1: 9d7af7ed0d01940d9479506dcd2165929923f6c2 SHA-256: ac09fb652eb0e1015a4d67a363c20d569efdbca2cbb9cdbde0a606424863c892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm on disposable hosting, with numerous embedded URLs. The presence of external URIs and the overall structure suggest it is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=boku+no+hero+academia+season+3+dub PDF link annotation
    • https://fablab808.com/nbloom/fckuploads/file/53940259150.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/26736883834.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4aad547be---pidexeruwasuxan.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/lenedijidoxapune.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090402254835.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/82162736784.pdfIn PDF document text
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/94387142888.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/46839054357.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/79892166904.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/6598017426.pdfIn PDF document text
    • http://coolscape.info/images/files/1434275204.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/44623624030.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/22148503506.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/desulirewijuguxo.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/39634008953.pdfIn PDF document text
    • https://www.confirmedtour.com/files/sajipoletesaweluladata.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/37275000115.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/64730159969.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/45156027721.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/23146716336.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_off0000a9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 11048 bytes
SHA-256: d1cd7d0c3a770bc75811b11a8586c27aa3fb76001374583b8235674d43d93289
font_02_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 14608 bytes
SHA-256: e2d53047630a5a92c357515eea148724b50ce48b5c1c89dc171e57bcc330fd58

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