Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4480deb6d9393…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 00:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8bb7bfe605fb23453b2a395f976ff35 SHA-1: 221c0ecea1a1de5a12d9c5a4f06f8db2d9acf2e6 SHA-256: 1da4480deb6d9393884de2759f14201c0bf3d28b6caccca23736bdb0b1398e12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kleinschadenexperte.de/userfiles/file/rurovapamob.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/paxazo.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/soriforefuman.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/medasubu.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kigokakukezenusasatonerox.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/pakomozagexovemow.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/xaxakoxakero.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/9012847457.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/pojego.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/vojanowinixepo.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/77409974358.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/vigedaduxefazinegeg.pdfIn PDF document text
    • http://nova-auto.com/upload/tudorav.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/78613510320.pdfIn PDF document text
    • https://computerzone.pk/file/vowenuzesosini.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/87691361787.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/43969268578.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/44294188225.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132264ba9936---62694686522.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wuduguk.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/45210379740.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/79030446733.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/1138679459.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3dd07a2defd2f66ff045c889e1397f33/tadebef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=code+alien+shooterPDF 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_off0000bc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 17724 bytes
SHA-256: 536f7924f39c6b97df0761b1723580d16b1076040e7812c7f3cc4d7df22acc5c
font_02_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10376 bytes
SHA-256: 2a59d65e422ff5888f47cfb617623b74bb133f2f5f19064b325dd98550d1a186

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