Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b87582c8801759…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 08:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cf0967bff618557ebc9e796ecd094c2 SHA-1: 71b4d324cf3d869ab084ac4e582ba11fc7b86868 SHA-256: c0b87582c8801759bd1f42c35b2763c43e92ebfaacf1cf80c6ca776c252aae2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://salvamontbihor.ro/app/webroot/files/userfiles/files/sosomegezetomoxilu.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613521f956eaf---sosubepivuzamiteneti.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jamiweku.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/80106341222.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zegazovepawiweduwewidisa.pdfIn PDF document text
    • http://agro-partner.com/Image/files/geburosotizof.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kemufemazefibesixufotena.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/pufoxizotado.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/1519460232.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/jobotimafino.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/76036910759.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/sulatevine.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210909_003349.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/81715197136.pdfIn PDF document text
    • http://cobmedia.hu/include/73351474816.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/xeligavun.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/pijivudubewiroxovu.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/66120015437.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210907_8597049CFCF7EAF2.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/25330090606.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/87905612894.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wizifok.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/68107053916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ranch+simulator+apk+2021PDF 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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 11040 bytes
SHA-256: b89a8eb2f46e8460b709b772d17ee3a3eff03fafea20c2bb599242f7a5925edc
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 19496 bytes
SHA-256: a11ac6a52d9d6e43faca792cbbbe99008c344a456b0c0f4aed2a30d7f38c62e6
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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