Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ead1b249ea2a23a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 06:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8617dd7b88f51185910cedaeb2bdabf SHA-1: c0f8447d5e0d56f33486b254739f757ddc99e531 SHA-256: 6ead1b249ea2a23a9e11994027be45ad4f1fd8809cde48eb5d282657de9c94b1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goodline.by/userfiles/file/97410018330.pdf In PDF document text
    • http://sellmysayarah.com/userfiles/files/wigabugenoditepimoza.pdfIn PDF document text
    • https://sanagustin.cl/files/17992048331.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jewazosoketubi.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kagaxuxavisevulo.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/25878402697.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/61238542044.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/20451555306.pdfIn PDF document text
    • http://kesifveotesi.com/files/nuwejogefotoradoxuvasava.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/99464902985.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mifigixeremusodasupew.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/34607495479.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fisafuxugadidebokugalije.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/kolamusazimilijip.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/dakugowexukopa.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gasirekimup.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/febukokoxese.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/satowasetotiv.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bibuzevatikupet.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/63259045336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=long+o+short+o+soundPDF 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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 21928 bytes
SHA-256: ac58371f5e7a1351f0cb1edfeada4b4a20fa6a9abab5c72e2774184b6c12581d
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 10152 bytes
SHA-256: ea30555711c63e872e4792562933b291df52fdb5301e026d4d20c6e6a14e6f07

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