Malicious PDF — malware analysis report

Static analysis result for SHA-256 e833d24378db3c0f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 11:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c088de896273d41175e37f7c3aa4bce3 SHA-1: 14d8b23c32239cc44ab0799d44c413e1ba7cf972 SHA-256: e833d24378db3c0fa4b42ee51aaefd426b278facdf1eb8fd0b89ab93c66ff554
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable hosts, suggesting a link farm designed for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://athaj2.specialty-match.com/upload/files/44187426127.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f5747d21102a652af43f6511c6d530d0/pebubori.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/23173065940.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xukuxizasusuvunomanekawo.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wafik.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/48819193781.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58932155614.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/54386070353.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/kobozakaxumisowekisen.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pipezetizanila.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zuvapomo.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/56806014985.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kosevigob.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dolegelepiritefonaza.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/bofokawi.pdfIn PDF document text
    • http://spyboarcams.com/files/nawarimixusesitotav.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2427049d---perevamowurularizegaxana.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/noluwojesakavezasuf.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/84964989244.pdfIn PDF document text
    • https://brod-plovdiv.com/images/62369428760.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/finopurodasib.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulodonevurebud.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/difadosekogew.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/88474327904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aplikasi+android+dalam+pendidikanPDF 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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10528 bytes
SHA-256: 9f58a40231be95c50474ab85adc7cf31b5ec84358d72debbc88166e12d7879aa
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 17044 bytes
SHA-256: 216b6cd2f914c93d29644665843d1eab2a9ea55370d21653751ecf3cd8a6fa1a
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1