Malicious PDF — malware analysis report

Static analysis result for SHA-256 510f6f0b4464150e…

MALICIOUS

PDF

70.1 KB Created: 2021-10-11 08:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6360f54e2d1fc01d8eebae71a7153d38 SHA-1: 349d56d5a7c0a63b9478876de8705ba0cffca002 SHA-256: 510f6f0b4464150e45486ee99780755cb0162fdc3a3fa97f29ea2f0baff3bca6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs suggest a link farm or phishing attempt, likely to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=distinguish+between+velocity+and+acceleration PDF link annotation
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/salada.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/28636918555.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/tijugevakewirok.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/21432537139.pdfIn PDF document text
    • http://regmac.net/userfiles/files/xugiroz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161638527a798e---pozunusizax.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/taxemomoxubor.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/1143396659.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sivekogojavurolokuzido.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/suvozajupuve.pdfIn PDF document text
    • http://cbstav.cz/file/42110717424.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/podoxelasokalo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/puweritobilopetokunu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vikujataximikajuj.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/werimekexuvepazigofog.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/18224069209.pdfIn PDF document text
    • http://apothepharma.com/upload/files/14918566778.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/74095331640.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/80263327677.pdfIn PDF document text
    • http://checopharma.com/upload/files/14032897180.pdfIn PDF document text
    • http://canadianrockies.info/files/file/lavozapimenupanoleremu.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/zemobomolekotadudewugavi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/66807809803.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/18524281245.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_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 14728 bytes
SHA-256: 62f7f128355e4267ee0ae2e094196b9092e81b7df4203e40992b393ef837c20b
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 11156 bytes
SHA-256: d0c7c5cf24799fcf48a24114192e67ac6f5ae1808870de8b29ce98fda47fbda3

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