Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbdb3e903488c79…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8fbff1d419e7efd1c136b663d8824a3 SHA-1: d0d1966a13537962e6c6cecf7400d0d5944e7768 SHA-256: afbdb3e903488c79b22c981cf67179e433148fb01b2aade7b1dbd728190ef13f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though obfuscated, appears to be metadata from the wkhtmltopdf tool, suggesting the PDF was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=es+file+explorer+apk+play+store PDF link annotation
    • https://il-gusto.com/images/file/fabixepejem.pdfIn PDF document text
    • http://packamate.com/userfiles/mopate.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/56062552640.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/40475551365.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109170813114965.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/17359406816.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/xipoxaluwizegejixawifu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/70394103434.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/betibijikimonagaput.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/binupa.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53097153286.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/setutexilovobogelegubi.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/gamisewogofema.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/baloninunaxepi.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/vegepa.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/64876492496.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/2124849051.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426c8d50eac---fibegodajizanudo.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/koguzovoniwosakatuxodesu.pdfIn PDF document text
    • https://nexusmediation.nl/files/70865478628.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/fekapaju.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/43678846567.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 18052 bytes
SHA-256: 122cc7e13e7a4c48ec4e83314f3736bd72b8a64d1fde1467afc21086e544854e
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 10540 bytes
SHA-256: aa747aaef6058ce3450b6a00d27205b9e39781d71d031381abe4ed3ea77a955e
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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