Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8b8ad701022dc3…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 12:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65a563b680c3140b72eee486d8be0e15 SHA-1: dedfe1d66ad2b2266f0d14155f395c14ad99b995 SHA-256: ac8b8ad701022dc3253405fc1b9f195f7dbf021bf89e62385f6efad477a36128
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://autostyle-japan.com/js/upload/files/54971170891.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/73907800711.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/satedepur.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/nemewepapijevokobo.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/ruvifoge.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/30981084245.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/74955587153.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/duvikasalirifusufufa.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/vudiledarebemaboz.pdfIn PDF document text
    • http://pjteam.hu/uploads/39314641515.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/37e2986e5ae3cefcf8e5666e53d4b039/62386145913.pdfIn PDF document text
    • http://goodmax.ru/i/files/86602545587.pdfIn PDF document text
    • https://j26clean.com/upload/files/wudipixetomafaf.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/zawutekoxewarugulip.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lotikogitefegexotupeji.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/40411743631.pdfIn PDF document text
    • http://markone-tools.com/upload/files/69385637770.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a573bb86d---66133439473.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/pekizeb.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xuxazolu.pdfIn PDF document text
    • http://cke.hk/userfiles/fudidisuzavosape.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/pefobegidiwaxarepowuk.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/19318348944.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/3700374680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=movie+zone+apk+downloadPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/zifikidulilivitokeso.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_off0000af82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 10316 bytes
SHA-256: 068b503592482e348502a087b6a6713308ebc1c2583bb67946e6aca0598a9e81
font_02_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 14816 bytes
SHA-256: 7e22ddac24e9c6580a078e0e8a35ca8d2830027c39e432f5b09b4201f1cb976c