Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97eebe310826d5d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 022df1b93d1d73f6ccd2811b3d1388f2 SHA-1: 016fa3f421e9321c4c087e6b331c74108b9d4b0d SHA-256: c97eebe310826d5dc4dfa618a5c293147d261fdc6e9d61c7f3e526f78439d680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://plafondchauffant.fr/img/user/file/56519632067.pdf In PDF document text
    • https://m-audio.vn/img-m-audio/files/fifapejij.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/72277052378.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • http://mqskin.com/luutru/files/wuzinamakitawatitoxa.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/nezaguzusodetit.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/6586302840.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bororajuromiwupesufud.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bujuximimazojelababi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/78333326784.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/pugolejelizeva.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/899300972613e7ae1244cb.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/53482428417.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tuxubepisimiditevipom.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/korusenanupawemifomilebu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/91352404476.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dawatimutosuvagozuko.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/lesujabopapaluwakavivo.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/42766586332.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/76756677392.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e9c12382---vonapunusawoga.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/bidunekosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+see+the+photos+of+private+account+in+instagramPDF 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 11124 bytes
SHA-256: 7187f9120925b4fdf500b7a09a19319c2d66d1da4d84c0faebd9134f659b7b22
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 18552 bytes
SHA-256: d7966472cb5ff22d4e06343c1b34d5946183322afda7a86453d755f7fcc9c705
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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