Malicious PDF — malware analysis report

Static analysis result for SHA-256 2856345c612877cb…

MALICIOUS

PDF

88.9 KB Created: 2021-09-20 21:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96c41b706b69222bd1ad6a291388dccc SHA-1: 08cd300829661c3fa00b49a359a3469f3c103e20 SHA-256: 2856345c612877cba69b0f142d60f52f19393c1ed7af42b64cd9b0aac3d3a506
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://skyzoan.com/cake/beta/userfiles/file/zomujusexatepafinuwokepo.pdf In PDF document text
    • http://violetstudio.in/userfiles/file/woxidupirilenozepekuxuwe.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/rofekozejedumuvaw.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/fowinedi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60279849496.pdfIn PDF document text
    • http://anindecor.pl/files/file/3202027766.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/27251971224.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/86395426615.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/bomuworuwowobu.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/30672194576.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/41337083128.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629e55b09---bevifamenodu.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/bijopononuwenumobipofoka.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/niritinirujelali.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c20b7be6---9378299430.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/zodorote.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/38569040571.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/91347744347.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/71063330299.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nixozipomefudad.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/fezibenotagetekiwugun.pdfIn PDF document text
    • http://chipgene.com/image/files/20210914_043338.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/43488306315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=quadratic+to+vertex+calculatorPDF 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_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 19932 bytes
SHA-256: 7edc7196f778e8cdffac17db85ac0e260d6b2ca55bcf3b8682a7f584b1a52735
font_01_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 10416 bytes
SHA-256: d4459862d510b92e035ce5536a537790d8b492b47e485385c6170c06d20ea2cf