Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2c5c4e97875b01…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 05:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50960c554ec15d210d18f60cc2d2cd5c SHA-1: 2eea2f2b1ea6fd424a4e20d02a083635cf7304fd SHA-256: 4d2c5c4e97875b0133dffc94c12ed4c5bd23d595519adcc4f2cf0ba3b4bd34b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fratellibeninca.com/images/file/lekukogugasixupe.pdf In PDF document text
    • https://glearningsolutions.com/userfiles/files/77398773333.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/biragivil.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/lutesokugo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/69732840210.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/37228397928.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jejiburusamimamo.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/67562692401.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xomikevidawigas.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/11638174457.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/joxipu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/migekawiz.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jimufovamiliso.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dorodama.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/43472636138.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/rapaz.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/nipekobozutanaketivo.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/81780002425.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/jawokesudadojadava.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/75293001738.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67478433579.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/79582000176.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/99451413472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=house+of+payne+season+6+123moviesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/399d251bf59493ec05c5d741aff91ef2/mojep.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_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 11056 bytes
SHA-256: 2a9b00fa9d7cfd38d6088bcec74cd14f37c81bd54b7f30238b1da8153e4a7059
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 15744 bytes
SHA-256: b96d491b2afe12e1070a6af6483c1aa8dd5f01288d7042ae33903203a3ff657b
font_02_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1