Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333ee2755d55328…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bdc76a14d66e8fac0b8c99630f46068 SHA-1: 4a83c7dd2a882d75a3deea596a69e57564f764aa SHA-256: d333ee2755d553289dbf2a1d98cf7a1e5aae585c932870476a480de8a638dc77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for the external URI redirection observed, which points to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=the+secret+of+psalms+by+lewis+de+claremont+pdf+download PDF link annotation
    • http://gomientrung.vn/uploads/image/files/mibutopirofakofu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454578e9dba---tunivuxetegewuz.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/bemaralenefot.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/52401779907.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/24319258542.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/26214154976.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/33759149499.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/73690391169.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/mobolegotarovuzofu.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bodezisirafajodixabowi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5605635373.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64564073970.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/13525538038.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/vinobefedugobewi.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/48404092148.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/33946689947.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/62985170307.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231507202708.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/melefivuku.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109140015181051.pdfIn PDF document text
    • http://hueide.com/upload/files/vefuba.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/lagesupijugolinusodozen.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/99928605187.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146d421be92a---75518372879.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917211316.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 11188 bytes
SHA-256: 473e2217bc2382817f6e2a36e024d1d4ba08562c68b90b4c8ef165acddeece6d
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 18124 bytes
SHA-256: 6352fdd20b83a008f94a789a45ad489a5ff3340dec07f6103948650c93e92a63