Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d389fd507eadf7b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d41720a861de15c08bfab7e1f056b2a0 SHA-1: 1a80676d77a5cd172c6769826a5639c1110af44d SHA-256: 8d389fd507eadf7b05d3e4d8843d782e12aa296b0adf826a722dd402c26f47b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, with one specifically linking to a URL that appears to be a lure for cracked software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=minecraft+pe+ios+crack PDF link annotation
    • https://multimetrics.com/ckfinder/userfiles/files/88333155241.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/84549796622.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435f8399ae2---xelubolilobirav.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/mewove.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bukobip.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/67629891010.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/18164682959.pdfIn PDF document text
    • http://skolky.info/foto/images/file/3060296881.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6198378126132861ba2650.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/zetavegavigotiwuxaxadom.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/78517289741.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gosuvedorosisaxugebozetu.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dafixejudemew.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408be8d03fd---lodal.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/vegemomep.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/85903318106.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630498835.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/94150092909.pdfIn PDF document text
    • https://brs.jo/userfiles/files/mowedagajavidigusexag.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebodumavaw.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/muzeb.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/gatusafafugob.pdfIn PDF document text
    • http://groupkaishan.com/d/files/kosugerumurewegij.pdfIn PDF document text
    • http://sarvodurys.com/userfiles/file/6186036621.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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10512 bytes
SHA-256: 70263a2bc9d95659702d35c158bb4ef36002e4f5bac2125ac267f1a4a7292ca8
font_02_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 18196 bytes
SHA-256: 20de7b2002f8f66e0c005db69df303c27eaaa5117de18322fba0fa4b7a89f050