Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b184b6bd96c17…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 11:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0055989f6554bcce5a22fb573a9c7570 SHA-1: d0acb78536f39108d4a6bda76bad4447654ffce2 SHA-256: b30b184b6bd96c17af538126cec734c667bdc702ece0c02a999195a4553887d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The document body was unreadable, but the overall structure and URL patterns point to a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=the+daily+stoic+pdf PDF link annotation
    • http://bjdfszwy.com/filespath/files/20210920211026.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/jukewix.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xezubagagizawatofimutate.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/bufemudenesave.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gatefigusojizos.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/11216910019.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/97158311062.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/63088888059.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/43418947688.pdfIn PDF document text
    • http://grimastone.ru/files/83345319545.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/piwabejujeropebudopef.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/45532846450.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/fezaxexekirumil.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/91926304791.pdfIn PDF document text
    • https://deepex.hu/hirek/files/lasubaliwikopilovi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/fogododis.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/68338717281.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d2ef366f---kafagoxi.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/ronufolivoputit.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/97247447750.pdfIn PDF document text
    • https://motecx.com/images/file/8226661003.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/86454150024.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/24540964892.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/62604968960.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10592 bytes
SHA-256: b56d1e53d1392e5a2c8489d29212409d2ef75e3cb9e65399c6cf211828473a09
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 18332 bytes
SHA-256: bee8238196dd8a8d392580cd299f730134261de96b23461f012b814c3ec0231c