Malicious PDF — malware analysis report

Static analysis result for SHA-256 b882fedaf40974f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 23:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f75b8613014aaa4b228ec899323842a SHA-1: 3ea1f7140e84c199e7bf39383896b76afd3dd926 SHA-256: b882fedaf40974f99a63050739d932b36b184bfb1ff61e6ca5ac401fb2fc5fe0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file that contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also exhibits characteristics of a link farm, suggesting it may be part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution and potentially spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://michellenevinracing.com/FCKeditor/file/23943369845.pdf In PDF document text
    • http://sevvalturizm.com/rsm/files/64007621564.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090217235712.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5mij0ln0hkmr538mdurhmvrah3/85194719462.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142940d2b4c4---42130473106.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/tobapo.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/46283266423.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/12942542890.pdfIn PDF document text
    • https://eniedu.com/data/file/20210902201524.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/26703122832.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zajex.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/vaxeperilirisolez.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/benugexugokeselosizu.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/33335189797.pdfIn PDF document text
    • http://btfa.tw/upload/files/25494895263.pdfIn PDF document text
    • http://snft.ro/media/file/bameja.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/98114550215.pdfIn PDF document text
    • https://tierlistei.ch/downloads/xesavagove.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/61364576869.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/59315408436.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/98979810930.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/13586739755.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/12988221818.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/75472895495.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/85779621168.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/lamoxekewenulew.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i8j91l3uk49f342c7vmt9p6ndn/43653471664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+to+word+macPDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10184 bytes
SHA-256: 2288015345f6e7e157169a0c0f507063c55c77b694840143ff681c781af61c42
font_02_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 17724 bytes
SHA-256: 1cf906b8ac4bfd90d093224db99c2060dde19397cf87945aabd51134ae0a9ea0

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