Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cf6d25c4392ac8…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 14:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f3cd4115d295ffffe4ef5a51dae74ee7 SHA-1: 47c7fb1f8c5d9cdbafe2eba228cc860fa58c0790 SHA-256: 89cf6d25c4392ac8ab357ba82788d4221873576eed2a749564f58d99517ddb44
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, strongly indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://inwebjor.ru/uplcv?utm_term=top+chefs+in+the+world PDF link annotation
    • http://sicilalluminio.it/userfiles/files/30346050916.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/riruvinejojaw.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pizupukokepit.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zodulokajukikaropaxuzasod.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/60880167747.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/36825944257.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/24068593198.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/91902888974.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/60368605007.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/18998463021.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/42627769324.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/4870802032.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/81662416176.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/gadudol.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/nivakadugosazigalesawase.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/lexarulevovasubadape.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/74518486047.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/47266453944.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cac3c9c3b---kumiwe.pdfIn PDF document text
    • http://keacg.com/upload/files/kumewimonesovatezowofi.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fukoweboriludamojiwet.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vigagobofuliv.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68160892887.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xototetotaxajezeveram.pdfIn PDF document text
    • 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16788 bytes
SHA-256: 70dd8e66114387b00da8bf9ce9c2d22c81ed9ff4e8cb8bce22254d7a407a67f3
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10604 bytes
SHA-256: 9e73731c6df1a4130802ad64cdce85ecf044b9b96ea8809adb221c0fbec62915
font_02_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1