Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3e7944c2ddd1b5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 13:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34d43c099af39f0523765d7cfb56c06b SHA-1: dc7ca037124105774d0c6322ba5110375986bebb SHA-256: ec3e7944c2ddd1b5edf57d8afaf0ffd674951cd8a0e6d5b6d9718d103a4cd131
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains multiple URIs, one of which points to a raw IP address (127.0.0.1), indicating an attempt to direct the user to a potentially malicious host. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dragonspond.com/uploads/files/18934776352.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/labisutimobupobutaka.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gekejidogixanotolejole.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/58840205281.pdfPDF link annotation
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/16925049583.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/12646270352.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/27607636935.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/nugofoweter.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/63197787957.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lufisadosogavorarodi.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/gusapulaz.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/6066753936.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/pogoxabuw.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/54366498367.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/67263965732.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/fiponawosa.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/56460534636.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95603962321.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161491079c4229---76036174161.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/60630664666.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090506540173499.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/41712285228.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/23575687864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nexus+7+boot+loopPDF 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10156 bytes
SHA-256: e43c5c7eb7f45f4947df372c5b10000a769da6e3e3af8ea931e7f624e244c174
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 18092 bytes
SHA-256: 9b27bcc445ce65527c51acd0065a98051868df36973b6ac78bcc97b6098397f5