Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf9a87ea47e432b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 21:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46a66d7899adbc978076c8b1ff650716 SHA-1: da273364ec58e639b9c5efcfa837059ec27c7a75 SHA-256: ccf9a87ea47e432b420ee79382d2db15b175814153951a265652f137fb9e1279
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely leading to phishing sites or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://marblobath.com/app/webroot/img/files/80823687791.pdf In PDF document text
    • http://hoadon-dientu.net/images/files/nunuxij.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3732512213.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/15053999471.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/13973597779.pdfIn PDF document text
    • https://mytopics.it/uploads/file/muxufavotede.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/15925818357.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/34932429992.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nuradatal.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/90960855346.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/91185749623.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090407524386.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/begagido.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/fazinop.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/30622890643.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/48127891894.pdfIn PDF document text
    • http://sunway.me/uploads/file/092240199627.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/zulazozazaba.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/vemawipalilag.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/tamanowipesewukitebifepon.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/22734199797.pdfIn PDF document text
    • http://eva.am/files/e2abc7db759612c9.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gobirafokupi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc7bd9e9e---lurupakuwidekubuku.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/numudawi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/62a3342894c4a1320fed26696f126f5c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=6+line+storyPDF 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_off0000b6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F9 10124 bytes
SHA-256: c297ec02f4458518061f49d5a176c803b2bd94c443e7ae2577dc8216b5e577f0
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 15576 bytes
SHA-256: 87027e1671e428e88810fd9cd92936aedd8704bee6f9abe51d52c87dba5d5071