Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9f6616d8b96c4f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 18:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e48e9271510c1499a361da926550fdb SHA-1: 1b3ac56436973b9ff4b67019ab167be452efe609 SHA-256: bb9f6616d8b96c4f893ce90887c21c872244104a8bc6db9c14c2a79e6df8ffac
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, and another flags the PDF as a link farm on disposable hosting. ClamAV detection and ML classification further support its malicious nature. The primary attack pattern involves luring users to download further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cgeminfos.ma/upload/file/22042043525.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61357100341.pdfIn PDF document text
    • http://93564497.com/userfiles/vuweg.pdfIn PDF document text
    • http://handgun.ee/media/file/8414683937.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/83e65fad94ba421bb1eef93654b672f8/kezupapaxetuwowufa.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/kegutifusef.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/8639009404.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/33873923260.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/riwoganuvo.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/setitagapele.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///dubemosigafisetejaz.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59138127704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1584bb059---9806679548.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/goniwovamegigo.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/bimomuzujorekovij.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/goweluziporebile.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/rakapudasufavijonigomo.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/42468046473.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/5839309055.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/visunodusukem.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/60402991364.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/43747911171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prince+of+persia+shadow+and+flame+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_off0000ae3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3D 16204 bytes
SHA-256: a090b863e3904bdc09e5b9c28551221d755170af6e493b7c0a07a5040d6b3e62
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10964 bytes
SHA-256: c0df41f4ff3d1540835a9a54d56da05004b3b7a021349db3fc4dad2313be2949
font_02_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1