Malicious PDF — malware analysis report

Static analysis result for SHA-256 783bb59cc6d29c72…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00aa3afc41296f02df94fc3cc2c595a2 SHA-1: 661d7a43e52e5ade500d244ac0eaef544de28535 SHA-256: 783bb59cc6d29c727ecbf40b2a4f0e21cd339a318eb47e37ceda25b2c9708eae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://upasamed.org/Content/uploads/files/138309161.pdf In PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210926_175147.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/vonosizoserotubaliwal.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/43070868592.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/65776613231.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/36697820988.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/gegonulerak.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/24061127889.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/netonebilakibipijufolizuw.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/popisukozafa.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/xutunadivuwupu.pdfIn PDF document text
    • http://maxbrio.kr/files/files/juxegowe.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/15268060913.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/niwijiwinokixibakanagek.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/74072458046.pdfIn PDF document text
    • http://sukhayurveda.in/userfiles/file/zilatabizi.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/depajo.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/73954403776.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/vabiroverenexigezabu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/tomeviwidiriti.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/62987996353.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/33441107805.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161538aac0f055---57992545074.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/40599535374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cheverly+health+center+phone+numberPDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 18008 bytes
SHA-256: 2c7d109ac268a00e7ce932729360c12d139f83a3df74cf91ca82cceda9f171c7
font_01_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 10832 bytes
SHA-256: c33d5fb45d9d571c776a36b173bad2717a00f974c2e4886d06ccc4dee30cf581
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1