Malicious PDF — malware analysis report

Static analysis result for SHA-256 93545e9bb2fddfa8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 22:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0effd53487a8ba58836aa5a423a6353e SHA-1: f91295cf5df3b7fd924a84f0b2850b8d25e20fdf SHA-256: 93545e9bb2fddfa8cfc36abdfdecd0b900ebc96509641c74c6ed29e9625d6686
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious workflow aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced50bc1cd---69333178598.pdf In PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xijagumupuwuzewuditob.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96350727968.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wavaxudedejotobip.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/zugomasixazofuxibagi.pdfIn PDF document text
    • http://innotack.com/userfiles/files/50402212003.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/27169938081.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/gufobotosasijogigaruzo.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/jimipisegikajuziji.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/tupidorilu.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/81774881243.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gojixo.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/13965762270.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/61067783959.pdfIn PDF document text
    • http://195exim.com/datas/files/bizoxanegemuvofujumapid.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kagilofadenuwezifavomujiw.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/26276484876.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/mezetumer.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4ulh88n26kkl0kj865vd478q37/72223799345.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/vojaposonot.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6302284371.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/30807281072.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/jugirexobowozavivuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aplicativo+gps+para+android+offlinePDF 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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 18844 bytes
SHA-256: bab0931e36a40f4b3f18435fea0a1d666b29d2560e37f14d4eaf859bbde2809f
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10844 bytes
SHA-256: 77d4f092f04ce77de7990e0cd92c816e85387e97ef41b313ae09a3b6c7096ce8
font_02_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1