Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d6beb6952d720f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 07:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10aee739f78dd4233fbbedb0106f2a9e SHA-1: 7732e104f1971109113b0eb65d53a092a37d2fa4 SHA-256: c0d6beb6952d720fea261272d8bafeb639d476e78f33819646062c8f03764692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious content or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests the PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://destockbaby.com/ckfinder/userfiles/files/95661521958.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dufubazas.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lazamirowebasoj.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/91476942847.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/19747192546.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131487aee8b1---38289613775.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/4391258376138833c817bb.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/reniribojolobodesut.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/besudujufusexorezusunusan.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/jupaxuxotom.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxovugatulu.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/ratojokaligefumixo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dubuxugekolamufutosaj.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/27969528811.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/komezada.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/peduk.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/vadaroluxisikerorugodipuw.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d74dc570---29233763934.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/10757151729.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/ketaxepavelatawakuvorifuf.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/jikepuzetarosevu.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/vifimes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=christopher+marlowe+faustus+pdfPDF 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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16980 bytes
SHA-256: efe1c4d137fbea524d03a90ea6f6c8dfc5e07ab9a745044a5651fa33aa016b7b
font_02_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10876 bytes
SHA-256: 1163e14bcbfcd0a088593ef997a1f1ba20f430021d69ed2a6a106b36ef64c2d5