Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c034f3767d85d8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b32bfc6479821eee4178633acf78d5ab SHA-1: 5bd89edfbd0d82f6dc1ca93d76435256deb6f7aa SHA-256: 56c034f3767d85d869166825327ceff49e4bb1ec4ebbe59e5b9f68f11256b846
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with numerous external URIs pointing to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://2016.letnifestiwal.pl/ckfinder/userfiles/files/xularirixujukubat.pdf In PDF document text
    • https://profm.hu/files/file/99126381971.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aa3ab33e60fff10e10a2614888053f87/67835177160.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nudizoraxawiwonuli.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/78185335981.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/turesuvatetosi.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/61053181523.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rexafopip.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/zonixidofonifabemaladanu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///kiviviwifi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/36576759483.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5866921192.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nafozobarazolivijowotimu.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/wegokavevamokedizak.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905032948_01w44k.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/duguwatif.pdfIn PDF document text
    • https://andana.us/files/files/zogaxawulazelotexigepefo.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091613454473499.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/74391516226.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/30280168579.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/12390660613.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/rigoxelikabitoro.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd78ef3f3c---71713989565.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/1539534493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+silmarillion+free+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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 17872 bytes
SHA-256: 55faa6f0988eb476f4c9a1d8df7ad6692f20133eda7ece0c103ea1879d323d52
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10628 bytes
SHA-256: 0d4138c780e87a8374934a21c347a76e1da6e1279c684eddc59715e69410644e