Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ae78f7d085df91…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 00:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3a097ff5714a23792afb5924ba03005 SHA-1: 80406439d60c062af66ca0a301bc9a19e52e3260 SHA-256: 81ae78f7d085df91eb90cf819f947671155483673461ebf4348242f48286de40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF's structure and embedded content indicate it is likely used to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://riolisboa.com/images/ul_files/file/3sGRN9JExlmY.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/61298285129.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/fewefopabaja.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ffc88078---21945225547.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/44981095153.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/71304295009.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/sitiranagopiguj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161451f114355f---26434761161.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/dabagadovadawuvepofadu.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/soximonolaledumutiwo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090522334573499.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/99955965148.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/bojoravupedexeladuvo.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/waxufaxeno.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46667238034.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/52594330789.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/70096566137.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/wazubeponedabomes.pdfIn PDF document text
    • https://shibbirs.com/media/files/66028903924.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/22038708536.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/jakegidoxipadunivemev.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/lamexozobajavigob.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/jelegabel.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/74983935995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+cast+mobile+to+mi+tvPDF 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 10468 bytes
SHA-256: 7a0d576f5c1b2f74e87c4ea90e0b1009d194f9eff4e4ab7d3fd6ed2336c9d6ad
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16248 bytes
SHA-256: 3582de19c4402254b6ad627ad9aabd4e8859acac260ce8562bef562741e0debb

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