Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aacf140d2efcde…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 12:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebf3daaaa88d777d3901d3edf533e3c7 SHA-1: 00fb7e4b6fd60fd2919364ea274a854cd8d34912 SHA-256: 72aacf140d2efcde08689b0e60cb546b0373f29d11231a8d8ea90552942319f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this pattern, suggesting the URLs are used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=top+role+playing+games+for+android PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bab861422---soxagitopura.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/rifuza.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/70198117628.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/torive.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/78393321107.pdfIn PDF document text
    • https://mollis.rs/files/11779505998.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/58273892462.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/ninurez.pdfIn PDF document text
    • https://poker-fire.de/file/53629615708.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kepejovotenaregape.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/26338172253.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/15004368177.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/23147525208.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/1656320346.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/51950529584.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/8551431607.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purewugu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/61048646847.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/kavawewimesafimife.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/58520619850.pdfIn PDF document text
    • http://tipiland.net/upload/file/7823449635.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/47762714461.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/45739370582.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10820 bytes
SHA-256: 894d1264c26e0416cd1dedd45552577f8f6ba711e1f5927d2fe991acc2620327
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 17296 bytes
SHA-256: f1988c0cadb91bb2a66b67c83e77fd2b911c601f7212d98da198b54f85c366bb

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