Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c9003d993aab35…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 17:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 410711d6aab9aca3afb5ced28c84a747 SHA-1: 6ec4361f59a953e0c01ca06ae85f10567406a612 SHA-256: 84c9003d993aab35eb3b25c91fd7b221e85fe43572fdfb32eb3d0b86a43cc04d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://medvor.ru/uplcv?utm_term=2021+money+glitch+gta+5 PDF link annotation
    • https://nidi.mk/ckfinder/userfiles/files/jivuwibason.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139945b58da0---xapovozadebuz.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109021416238474.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/didizigatutobasokodofeso.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ritelofutajob.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/36186487911.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://kmsenior.org/file/files/56522744037.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wadogizilu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tajegegef.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/47544354194.pdfIn PDF document text
    • https://phr4u.com/files/mitibilalomunug.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/64219533927.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/nolomiziremazenikafiwope.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dewego.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/19863045156.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/2490356323.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/78080434926.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/56709975034.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/7236539748.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/33583803391.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/vexivuwakejomazof.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jorike.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/55576124597.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/wepolorajov.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/ratobugogeregomozebeseguj.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 15068 bytes
SHA-256: 527d1aa98e36a96abafc107407e57be62d012d61e80ed11219105a48876c6f46
font_01_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10856 bytes
SHA-256: 639bf190ae99f1bd86db09cf279f379aad24b132792122a4a5488ab5d96a191e
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1