Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b14af6abd5a704c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 20:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61a4b3be513177d19240ec4874570447 SHA-1: c2483249efabaf8b4254367ab705c06623a46a3c SHA-256: 5b14af6abd5a704c5c47295ffaab3520dce6487558757e0f0cd1a78e47d71db8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The PDF structure and embedded URLs suggest it is used as a lure to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crysiq.ru/uplcv?utm_term=igtools+free+followers PDF link annotation
    • http://rhondachem.com/d/files/voromusogisegi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7la2hs429b7v7d6udl7jr2l031/45193676227.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef899a9ecc---65781969695.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/nakifaseribosubevi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/41340845653.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191171623.pdfIn PDF document text
    • http://deforma.it/userfiles/files/32939239885.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lagisinufatukawafo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/fesugi.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/giroxomoralamuzawop.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/57819794619.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/76859880725.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/fusibo.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/gewipojigitusofisupo.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/digedabaxasavusiji.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/7035390658.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/54569754215.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/24725204667.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/xuwuxo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/15568642770.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/49267413490.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/bawigidevalodobirinafolub.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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 10068 bytes
SHA-256: 6ecbb95d555c3742a197601585de56af31815cc1cb52d74ee908b0d2c7ff8a10
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 17288 bytes
SHA-256: ff63633aa1c90c472e3a434a81ba689f02f8d6048f8300731878c18901ea9891

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