Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fa7a0eb5248252…

MALICIOUS

PDF

92.0 KB Created: 2021-09-16 09:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 776c70630f5fd51309230dda6ed750ea SHA-1: b663f154c969465454119e557ffe12ece370a4df SHA-256: 80fa7a0eb52482523ef54986ed55370333206fdfc0c6a5c9983b2784a2e7df7a
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or to download further malicious payloads. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://tmkb.org.tr/ckfinder/userfiles/files/gasov.pdf In PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/49139602320.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32071548731.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df16e5c283---41652384239.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bamazanusukavo.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kukebetigibubavuja.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/49038382389.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/31860973203.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/91719893584.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/6785230656.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/22528235781.pdfIn PDF document text
    • http://naviway.su/upload/files/37258861284.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971530173550.pdfIn PDF document text
    • http://full814.com/upload/files/98246360164.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbff35c370---dusesuduwozolukega.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/35813045109.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/33517615423.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/povut.pdfIn PDF document text
    • http://silver1979.com/upload/file/81626505306.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jowiz.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/29993034580.pdfIn PDF document text
    • https://halead.com/uploadfile/1630830023.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wuvarisubebino.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/gufowom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=janibcn+war+full+moviePDF 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_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 17408 bytes
SHA-256: f834b62a5114522652e0fd195c90cfa5caea79f72594053ca2d99d2105fa348d
font_01_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A28 10612 bytes
SHA-256: 5bca19ec831a139696965ca4e56a106b153d491ef6fc64a35a01164f4d975873