Malicious PDF — malware analysis report

Static analysis result for SHA-256 e071684eed078757…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 01:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be94f0dd71cb46b38fdfb759b368258f SHA-1: c7448d94128c53dcb710b10d95f689fea23d3d39 SHA-256: e071684eed0787571a6e3722b4c01031bdaec140bb9b63eb66adce8a709b8fbb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to disposable domains, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdf In PDF document text
    • http://jingyilin.org/uploads/file/nagojovonopikoma.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c2048b49---mivizodanelubojuput.pdfIn PDF document text
    • http://bndweb.nl/upload/files/gigibisaz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/40492181066.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/26301248923.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905150426_1091946887.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/90753333595.pdfIn PDF document text
    • https://peterdegendt.be/file/wojavivodalinudekogosofo.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gujefemezigo.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/damepazizixupaji.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/darofanowojomizevalede.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/73434434211.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/32992662556.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51b358ba5fea27942134e13dc1f881f6/rivawadugiga.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/71392241330.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/gidufidu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/murulagekup.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/48354471532.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wedinadesolelodes.pdfIn PDF document text
    • https://partnermind.cz/images/files/xevufixobazonarofesaba.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zabugeme.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/10931612502.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/70609508629.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/94502074686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=big+cash+apk+all+version+downloadPDF 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_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 10992 bytes
SHA-256: cbf27215b166636023596e34f215c8da4ac3d9abb0c65c49e5156d3ce2f47fc4
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 18744 bytes
SHA-256: fa5141e538d55e5c059f145809c2b43b9563901c386299b939cd6493bb0f9a44