Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b7c7840c2bc119…

MALICIOUS

PDF

73.1 KB Created: 2021-09-27 04:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7691b0cf7f0ff3f7397041695f9add0d SHA-1: 48588c383ca37cf867eff6f96a022cd92fe71002 SHA-256: c1b7c7840c2bc119cdb3a2638432096b97f772d38b3f9f91195a88dffe0e7a50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=prayers+of+the+faithful+for+funerals PDF link annotation
    • http://agataklimowska.pl/userfiles/file/78129776328.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/bebabopadedek.pdfIn PDF document text
    • http://www.bash.cl/media/file/lewakodusuxiwumimovol.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/5914417019.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/lisubejozajaxirekovisu.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/domalutiro.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/27111943722.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/vafawuzakalarekakuweb.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/dolafugunikamifetanun.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/2051889550.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/54235210414.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/joraneliganugikigavato.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/26083382007.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sapifipiwiditoja.pdfIn PDF document text
    • http://jarosi.hu/files/file/tofexonu.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/67270634735.pdfIn PDF document text
    • http://storemisr.com/uploads/files/704063089.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ea419dab88589930055b45faea7efe58/45909485122.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/59084539602.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/jeralokamasugakinurabotu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/lasuzajijulekiguvori.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/mozalovodebate.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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 10528 bytes
SHA-256: edc6f3caf70f4f5bfaea0addcd3338c4a3b9fd07f06317937f38f0a5539f9750
font_02_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 17920 bytes
SHA-256: dbb4d8dbd613e8e1dafcf0f8c088be261aa3c7b3f1796adaabb247bfa43c7d9d

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