Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ee40ba9f20fe79…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 15:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 766b03cffe034c55f5069e4f04285d91 SHA-1: 37601fa5b9214a1c04310acd1d38a538b410cbc0 SHA-256: 27ee40ba9f20fe796ca7c00794ee20c078f8f68056c90339beb9d818ff1624ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to distinct domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coeb.eu/userfiles/files/muferamum.pdf In PDF document text
    • https://marblo.com/app/webroot/img/files/jixir.pdfIn PDF document text
    • http://meskerjager.nl/media/files/didesuzaxuxaxusuxu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sinox.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/9528a616950a2da06a75ae321b99eaec.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/78287175778.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/luxaluwojewawer.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/19548234250.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/57036225794.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/norowobawodulinu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/libiwexafatobi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/93989082458.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/1235007016.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p4ngjp9rt2usk4ghppa6hd48vp/59351581836.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///83298588263.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/25929992931.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb2036ce---3048539654.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/4204937535.pdfIn PDF document text
    • http://thedreams.cz/files/wezofe.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/50703501489.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/2087885703.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/bofomiguwizaxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fort+conquer+hack+mod+apk+downloadPDF 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_off0000afd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 15708 bytes
SHA-256: 3968fdda649b554fad28cd78db311bc8501687f8e473474189c79e9c782da4fa
font_02_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 10920 bytes
SHA-256: 9d6b4ae1fac1dea45c2e6da4da7a9c06f73b221a01f549b303d1aee3cbad4810

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