Malicious PDF — malware analysis report

Static analysis result for SHA-256 26eab8c2406f07b5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 10:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44290951d2794c64de7998ec36357e1c SHA-1: de097f1cebe1d535674f34a7c56a97558922d7b0 SHA-256: 26eab8c2406f07b5049bde50dca5c0e0764707bef25ecd80948f5e892ccc454b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting it acts as a lure for phishing or malware downloads. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.chatanakonci.cz/userfiles/file/88481296600.pdf In PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagelopuzuwebidarit.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/55805335513.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/lewepapufiputenik.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/firaramod.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/26953234084.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/dudibodutaxilezodosabivu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/47411641692.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4a28951df8b6708c5f8aff4de0d2dc35/76045148333.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/dewigawoge.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18449723402.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/vowisisapofezet.pdfIn PDF document text
    • http://abwrva.com/uploads/files/69313983709.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/19922754950.pdfIn PDF document text
    • https://grouptm2.com/contents/files/78065468470.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/petuzuba.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/43240637848.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/33281415678.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132daae13ea5---birosajo.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/71828023431.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tosegijeloleleriwojefe.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=skype+problem+on+androidPDF 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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10708 bytes
SHA-256: 64dfcace8a0dc8067b87acf84ff128cd21b92a06ca7b2e5054ddb6da5c4651b1
font_02_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 18200 bytes
SHA-256: 5ae314599057daa373bdc9a33df3f56d3899d076c2d43aa2a7403d418cf130da

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