Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad23e510d407ed70…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 07:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a231c0e11733f87c4875b5144cb78ba3 SHA-1: 18474673c8432bdd509b626b72d57840295e5fc3 SHA-256: ad23e510d407ed70e6a34b535afbdf49ebf6fc8b3c97e4d4a78627d668a2ce65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF structure and numerous external links suggest a phishing or malware distribution attempt, likely using spearphishing as the initial access vector. The embedded JavaScript is likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://www.enfersalus.com/ckfinder/userfiles/files/fosugififikasa.pdf In PDF document text
    • http://9275522-travel.com/userfiles/file/wetun.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zuwanef.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/labilenavovudivoti.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/63165826484.pdfIn PDF document text
    • http://asvpp.fr/pdf/85042520980.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/nirubipatewob.pdfIn PDF document text
    • https://labelmarket.eu/data/file/15782250086.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/54957257836.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kogevejakekonomalewutasi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/86669453105.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gakil.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/9178678401.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/tizebokat.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wipifirorakoweg.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/9248938994.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/43059611986.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061102511293.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ttmabfhiki6g2e1v5tu18alh/87092057714.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/99471074648.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/55639419282.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/loxofiwuxijimerukesezig.pdfIn PDF document text
    • http://ossokahve.com/upload/file/wejoreguporesozeluwedu.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/87898409704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=descargar+adulterio+libro+completo+pdfPDF link annotation
    • 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 11100 bytes
SHA-256: b62c4c4d6303ef0228b9f2c14040b38da1c5d01dd2155e7003ae38f69fdcf343
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 19364 bytes
SHA-256: 636ea5410355ca2cdae681f7c584e7dbca5db3e42b5f12a779d37e174d4e0689