Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40c2610c9a9f7ef…

MALICIOUS

PDF

67.3 KB Created: 2021-09-20 06:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 32ec9d77f4af5d5333f42cbf8675c435 SHA-1: 7ca24fea227ac48b3fa0ab1ffc8a0123a63480db SHA-256: d40c2610c9a9f7ef1a790bfd73b6bae2c47f75aca6a71134d3beda6c970f5e15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are structured as link farms pointing to other PDF files. One prominent URL, 'https://pistant.ru/uplcv?utm_term=download+far+cry+1+android', suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=download+far+cry+1+android PDF link annotation
    • http://traktorpulling.de/ablage/userfiles/files/vowakikimajakaxugubozuz.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/gexefokijuzitokepixebe.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77844816902.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/20528080408.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/nededufofikobukizamez.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/98461049823.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38500461877.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/25697823074.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/49583921006.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/66001109252.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/22602092086.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/raxewusikafipinak.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/ruzejiverij.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f34e0cbcf3a3508fef9cbe5a2a1e4991/xufewuxebazari.pdfIn PDF document text
    • https://promise-land.com/upload/file/43182776710.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904180347.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/55039339791.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/gavolokaxeze.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/dosupuwujifawewotosuz.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/turuvopekimixoz.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/lewumubemer.pdfIn PDF document text
    • http://carbontuning.ru/file/soxulipudatotadabagoj.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_off0000ad06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 10324 bytes
SHA-256: 3853baed8b36e49b5b9c10784acfdeebc9fb5dc32dc97ca4add50e1ccba22c9f
font_02_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 14192 bytes
SHA-256: ecf595528537326a3b81761c68176d409ef97f6adb65dbe752fb5f2472277f5c

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