Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c66287f70eaa3f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5b52fa7728004ce90d45d1c18df7844 SHA-1: 5032cab33b1f1e5f8139036bf5407dacade9fe4b SHA-256: c8c66287f70eaa3f79e3527b50b873b417dc469af43c04aa8028a51197db62cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and numerous links point towards a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://handinhand-daycare.com/ckfinder/userfiles/files/tefalamefi.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c32b57263---7691489516.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/feraxozawaxuxeg.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/sukiwotupitovelevoba.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/68581616704.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/53733629160.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/difidiluxul.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/midoworegiduzeripulor.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/811171013.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/nodaduwegamarujawigu.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/bafapopobuxojutubuwim.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/barofujemusoxibitan.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/68038622772.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/65676423132.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319e66349a5---62118398064.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/78769080316.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/39151590300.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/10717665792.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/xuzasukoromawebamowagexa.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/68365305806.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/45933604941.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/zifibukarutufo.pdfIn PDF document text
    • http://gibisch.org/files/files/57557520686.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/77658293805.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/9592449832.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/90851567734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wwe+2k11+apk+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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 19596 bytes
SHA-256: 073cf8eb5b33ac382a2352896df493f3b8520e211f75376dd39064894973588d
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 10272 bytes
SHA-256: d0f61c6f6ddc69185c2f4c3da4fa939ce9ce31d61a9356c064a023a7baa4a514
font_02_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1