Malicious PDF — malware analysis report

Static analysis result for SHA-256 788a312d7ebe734e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 20:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47e52ad209258c43d896e1302446c672 SHA-1: aafe6636f28f688640f4d628eecc5005bce5bb5f SHA-256: 788a312d7ebe734e2c079b2c6a9df04d242d03b6af95b7f9d27c3a3809c5288f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or to serve further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://riosemarescentrodemergulho.com/ckfinder/files/59745096325.pdf In PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/wosezesexarogupiruv.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ca024ee493722a22c5821213709d5e9e/4719990918.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130aaf5ccbd1---lexebaxawuwawazodin.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/33883361451.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/34710753517.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/72482455712.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/lezovupotox.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gibevopajevogurag.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/40647824850.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fewiw.pdfIn PDF document text
    • http://rhondachem.com/d/files/77308038925.pdfIn PDF document text
    • http://polletnv.be/uploads/files/81892645467.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/visegegazapokisifapose.pdfIn PDF document text
    • http://cecev.com/stockages/files/mizugixivuxozisonegerupa.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/zuvulew.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/molezitonomanesukaxa.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/bemomemezotirevijosex.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/rubabon.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56072364658.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/46067258276.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dakuxerajav.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/17725580173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=love+language+test+for+singles+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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10796 bytes
SHA-256: 4337574b202c56cc07843d3d35aeef65c36bf7357e37a8b0ddc0ed51d1603d57
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 18144 bytes
SHA-256: 10acb864c97aa70a5e48064f8c19db908f5f3aa34323959c730cfd6d0fd2c1a4