Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69a63b9598a6403…

MALICIOUS

PDF

92.1 KB Created: 2021-09-17 09:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ede1298e5c257eb4c196351f6c4a8d5c SHA-1: cb8eb99c7ccefc6a5deef8873e6c7a364098c69d SHA-256: c69a63b9598a6403a3ae47c9a47adbea909fc71ab7dd4929b046a5b53ce94f7b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection indicating it's a phishing trojan. One URI points directly to an IP address, and another is part of a link farm hosted on disposable domains, suggesting an attempt to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ww150006.linebot.net/upfile/files/20210905140044.pdf In PDF document text
    • http://pasted-radio.de/web/files/92096034809.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/ronixud.pdfIn PDF document text
    • http://mobiliteit.nu/files/91599278823.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5967731575.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210901173056.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/leripedurim.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tokiliwusowakawil.pdfPDF link annotation
    • http://studioingegneramato.com/userfiles/files/32372333581.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/1627383132.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/ranesid.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/sesavusafabonijusemif.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/87018834255.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/66566646628.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/68345007680.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/mitexomikuwuzobosido.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/66931563542.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/25364418313.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/23879440402.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/25017920265.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/37496514019.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/96235475933.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/81778405318.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/33805465939.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613ed82134d38.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=feudalism+middle+ages+definitionPDF 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_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 18840 bytes
SHA-256: 8323a208a4e33e2e288997af0aff3056fe8aa472c9479c0a3f313f0865cfd84d
font_01_sfnt_off00013286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 10676 bytes
SHA-256: 4568391d966e270a7e373e34c6edfbf3f8aa45b58c81b53e2be621e8ca163e18
font_02_sfnt_off00014ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1