Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc794506ae8d7be…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 17:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0cf3c511adc44d6b1c0b93ad1f5ca48 SHA-1: 8645e8aa09fd9d4e4e76c396e5197c9de55984c2 SHA-256: dbc794506ae8d7becc792165c8bd27e778085c24485b5df54a94d5b49c0146fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=ccna+r%26s+pdf PDF link annotation
    • http://musicpark-live.com/userfiles/file/jaguwevopiwiwofaz.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/95107938798.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/33477807407.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3f447a78ad1db3b6e868c5a0aced7112/31102106722.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///16539888851.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/rofekozejedumuvaw.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/1257545497.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/topefow.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/58558407214.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/18547529783.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12414466644.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108d4ea2ad---11249579121.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/24492520851.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/14213217546.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/dajajive.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/61911588907.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/bimozefimatuvelalavizatoz.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pabarolivumetimijabidul.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/titoda.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fuluxujeli.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090721022070554.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/lirapilodomolijonamatu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/7789132861.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109112303201370.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219294676173.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_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 16592 bytes
SHA-256: 7921bc7ccd5c307a9b1c9a9c5d3f5b4c58e50f15f20a8a4759419959c4b4e051
font_01_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 9596 bytes
SHA-256: 621834ccb4cbc1a177d6a3b07c54f0824593e9bee26c97a76ea250d8ce22adc0