Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73a277ca29cadab…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 09:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd3282954aa1bd4ad97daf116b7edb67 SHA-1: d450724630f9b889e31add12d2093ce9bc5d4164 SHA-256: f73a277ca29cadab86bf71f22fec15c14e57f583412a5d64cc8480bbaec33fd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam, by directing users to potentially harmful websites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=read+deleted+messages+on+android PDF link annotation
    • https://stvorki.ru/files/file/zoxadutikesuroto.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tunuxonoxovepakigetomatoz.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/68333630398.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/silutirek.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bisedapoxaxu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/ramisabapujipawe.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/73621002692.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/zagiwa.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/zojinupiroxad.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/ninufikow.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc155b376---97634064071.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/fexibixuxidez.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/94790373163.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fazoxisixixib.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57771814302.pdfIn PDF document text
    • https://successalpha.team/upload/files/72635738336.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322762e682e---4835515877.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15190995812.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/jugeka.pdfIn PDF document text
    • https://n-tlg.com/files/file/jukupupo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/94713761080.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/padiveso.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mapawevak.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109151233017059.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/96588958905.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 18736 bytes
SHA-256: df4c8b61778de4b035073a82f8578eb37b01bca639a9e1561a5fd9e9f4f7fcf4
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 10636 bytes
SHA-256: 9e9a7eaa13f7c55f28aa087eed5539f3d0811792c02ab9a4d74b0d6fb5af4f80
font_02_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1