Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b90d4574183370…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 05:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8f4b4ca096029dc17f0aba9711e51ff5 SHA-1: 3e900ecd2def0e8b1681fe38f86d03617a06a224 SHA-256: 07b90d457418337022d40cd4ec61b08cb7e435c5ff809907aeffbf34bf15c394
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to a link farm designed to host a large number of PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bright-mineral.com/uploadfile/file/2021091018582420.pdf In PDF document text
    • http://carszana.com/image/upload/File/1294566364.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/20935958326.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/79304760306.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wasatovava.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133040ecb067---12737413407.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/29376376321.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/65069133934.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/71698221892.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/8273032074.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/90118560957.pdfIn PDF document text
    • https://suncables.co/images/file/22821263435.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109070136158802.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70867035815.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/62903421117.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/43042792721.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mirusifoz.pdfIn PDF document text
    • http://i-physiology.ru/upload/duxavufabe.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/9263195230.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/90203313898.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tobeju.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/foxamogoxepufinakadukana.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xugidepuzuzoxitupasukuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=merchant+of+venice+bangla+pdfPDF 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_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 19192 bytes
SHA-256: e72960f76f3c10ce45e185ae1c30092fada70657b0045b488490e67124257074
font_01_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10928 bytes
SHA-256: 741a094da240aa683ae573f1b24fac757d4459b5ebcb2ee5cb62870350feb9b0