Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee103cd833597f2b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 10:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f150e2e405c9fd2056a5fbece09784e SHA-1: e12337023b11ffb591fa3edb517935ab7db5407d SHA-256: ee103cd833597f2b48b1807be9d3a640b38b3196908ea73a0638456c9d019c56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://csc0512.com/userfiles/file/20210905124354_tslog3.pdf In PDF document text
    • https://istanajp2.com/contents/files/sugamajezaz.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rekomovutefejasesi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nafimibuzu.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/dewaki.pdfIn PDF document text
    • http://zenithmetals.com/files/jenalenoxi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/xudafagota.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0rnuq06h8foaesbifku41th6p6/9099169678.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/51580816913.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/43406273555.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/xurepo.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090611143328.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/5792733011.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/89463094633.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e1dd32e7---98313350629.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/motifariweridebol.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/retorerupopatimiwanu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/27642122739.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xerunazase.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/kubap.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zefiwinunoruz.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/64466250902.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/dibeki.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/17478080861.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71808873388.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109171058486639.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/47030923107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=play+store+download+issuePDF 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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10544 bytes
SHA-256: 3d23f6774ec337ea441c7a980bcf1f266901f9ae5684dda06ddd4c94f9895753
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 18080 bytes
SHA-256: d396db152d2d810df0dddc56d26d109e630e8531f7af3df17e5280c486b949ae