Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ead80a8df5b2c06…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 21:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5085a4ed2daeead0fb93d9eda498aeb SHA-1: 18ffdf5aeb19a22c6a40dc07d6ef079b0d03868f SHA-256: 8ead80a8df5b2c063c4491a9ff2bdc9762069030105f369f4a48f33efec3c464
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on disposable domains. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://markapin.com/calisma2/files/uploads/meguziba.pdf In PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/46964058726.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/9063466735.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/jixir.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909054915.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/27450647243.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9bc6d5b1d3d47fe2d4d7c3d1f62ed53/35417581331.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/22785029076.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210911235448.pdfIn PDF document text
    • http://parentini.it/userfiles/files/38560456988.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/nevakezosi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/59000120908.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/69544200696.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/74285748501.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/poporanujiwinuralobufasar.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///66314246095.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/tugelegozilogaf.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210910070352_bzmnrz.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/fosexedupozizateref.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/dazozo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75501737037.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613864093ba4d---fasarozetaxuliwevi.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/95463601684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gradle+ssl+peer+shut+down+incorrectlyPDF 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_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 24216 bytes
SHA-256: 1008e2a8ec875919eb872f1642721b23eab810967f9a85f2bd5ec259208b2eca
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 10948 bytes
SHA-256: 480cc90c783e347460e92529720f5457566853c776542f4b7c59d0d372c810ab