Malicious PDF — malware analysis report

Static analysis result for SHA-256 769d79636ca5139f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 10:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f191df8e8ea9e11250a03ca34dd9dcea SHA-1: 105e4af3b2a56fb127d353153c41c5e283e964ed SHA-256: 769d79636ca5139fb85370c400fc782ca8dabba0e4f2e401dce883f9b5f91699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=super+vpn+premium+mod+apk PDF link annotation
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/pumakag.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/78973643773.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/28006809790.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gisijomefud.pdfIn PDF document text
    • http://irinabailey.com/upload/files/72451774261.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/dovetozanewuxonalu.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77140405516.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/jeziripiberiterip.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/5604827171.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/98109705067.pdfIn PDF document text
    • https://bursac.net/userfiles/file/61981443233.pdfIn PDF document text
    • http://haai.org/upload/file/14799369881.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bijemaz.pdfIn PDF document text
    • http://mayjack.com/upload/files/82299316952.pdfIn PDF document text
    • https://makenie.com/upload/files/77135089470.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/genomewegewumok.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fugiwofetirefaleririvusu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/7121654315.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/38323374326.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/98730611079.pdfIn PDF document text
    • 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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 18764 bytes
SHA-256: 7aca2152a742bf9f6b41b69b3f5435799e6eef4dee231c72dc76bb92364d564a
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 10572 bytes
SHA-256: 3e7e8972bcc4dd4759185b53c511b9188f885de9ffc91eaa09b1520e769880bd

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