Malicious PDF — malware analysis report

Static analysis result for SHA-256 883b8b50e7664bf8…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 15:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97e1aa273120e1d9e5dd8a60d2b16bec SHA-1: d763c854d9c0a449bc53a7d889a211b88fa94277 SHA-256: 883b8b50e7664bf8d93bc8bfbf2c5962b63d01290165971f2228abe33165dc81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to potentially malicious content, suggesting an intent to redirect users to phishing sites or download further malware. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://khamtribacninh.com/images/files/91652147808.pdf In PDF document text
    • http://ramenzoni.eu/userfiles/files/popevixumalujekafajipiba.pdfIn PDF document text
    • http://vaynhe.com/upload/files/busorigotudexufetigixizop.pdfIn PDF document text
    • http://klaaswester.nl/img/file/95731441486.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fe6a7a84---moxosa.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/73174860763.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/jazunolux.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/kikexuzavoriv.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/12648775313.pdfIn PDF document text
    • https://ms01bet.com/contents/files/mugokokigovegurumo.pdfIn PDF document text
    • https://onlinendttraining.net/files/16341649351.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/matokebixuxosolujikip.pdfIn PDF document text
    • http://okun.su/upload/file/74218985264.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/mewoxariginaludupuvifex.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/xasubufevewawokafofirukor.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/32850609600.pdfIn PDF document text
    • https://latework.cz/soubory/mexakogikiwigo.pdfIn PDF document text
    • http://flexa.cz/docs/file/15267672827.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xijivakasa.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xugur.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12659206501.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/22895792217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+setup+android+auto+in+carPDF 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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10640 bytes
SHA-256: 62e9e4f2773c8ded10666c13d19f2fd29e0fc8a15fdc3ac80ffa6506d978fdc7
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 18276 bytes
SHA-256: 995320628b5a3642ef9e012ce8015e83aec36f35191979abaae9e64b3fdc97f1
font_02_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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