Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9798e896459c62…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 15:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 723663e40d9ad572510112d5171a532b SHA-1: a5e573f1def9749e00e28977a10d6c4ab23814a6 SHA-256: 5b9798e896459c627a926e5d37110ed55e148d9c28af0e4528bbed9da3f47979
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to suspicious domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thegioimercedes.com/upload/files/takubasejunomipeni.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c073e96688---7466921975.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/nikidaxusiwo.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wakumokew.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061252407483.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109090455126883.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dalexokixadaxamumagumam.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/34212833784.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/gijebolaretuxoveboxe.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/6165081518.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613576bc201e4---2508400998.pdfIn PDF document text
    • http://torgoborud.org/images/file/78660944548.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/wibogapamizakanogu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/20579770819.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mexadomilexavirizovexud.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/13479240860.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134325fcafa7---gopipinovojogetutanaluf.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xeritetadi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/bagegubadumobomukuvisujef.pdfIn PDF document text
    • http://indel.sk/userfiles/file/sirel.pdfIn PDF document text
    • http://mandarinusa.com/userfiles/file/1630982833.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/gazivunatelaruvebanefewa.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/xiwenemefikozozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+below+her+mouth+full+hd+movie+streamingPDF 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 11308 bytes
SHA-256: 0153b6e41bb50582eaa9bcd80731607134581b5edb27d5fb3b586e6ad8065df7
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 18456 bytes
SHA-256: c87a98e3409ecf63f4c97cbcfc1516d9aac06145254d2d5cda49cf08681b13bb