Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62a610d57b8ed74…

MALICIOUS

PDF

71.2 KB Created: 2021-10-05 15:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 374867043727b998954f7a358ad4e478 SHA-1: bf2b521ceb6ab8a6eac1d35ef080d6164b40693f SHA-256: d62a610d57b8ed74ff34f93cecfe691011788fbb9430717204aac4eb22ea13fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document utilizes a link farm strategy with numerous URLs pointing to disposable domains, likely to obscure the ultimate malicious destination. The presence of embedded URLs and the PDF's structure suggest it's designed to trick users into downloading further malicious content, potentially through JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=assembly+language+tutorial+for+beginner+pdf PDF link annotation
    • https://ekransamara.ru/files/48936359201.pdfIn PDF document text
    • http://esangsok.com/upfile/files/repodusu.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/dekob.pdfIn PDF document text
    • https://estoniapools.com/contents/files/vokorigopeko.pdfIn PDF document text
    • https://labelmarket.pl/data/file/zopinalodibopikugot.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/vuganidesizaresafabeleko.pdfIn PDF document text
    • http://imbirimbir.ru/files/gidopepitepur.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/xojebaxatilamibevukemimoz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3a3b2ce89793907e7d5fe561045f3347/zazowunipafafokuju.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/86213689619.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/zopizideti.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/mamoduribiwedorekavafediw.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/70407483722.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/13922321958.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1633039742_bde6784fbe.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/rakewikebedafetageposolu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/17951651090.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/56447338677.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614922429da6d---jigima.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/dezunigulojesurosagaxamil.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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 11176 bytes
SHA-256: b33751b834d437ca3c6861d77aab1e7a0a0e210abe3b7ca28036c500211909f9
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16292 bytes
SHA-256: ecaa9ebc664b67ebe890df1443f3f279427bf2c032b1bc3f3364edddcfd139c4
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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