Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6438c974b288579…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 13:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ff0f03c9162d18b03690d986e3e77d6 SHA-1: 3b543fbfbeb69293ed319ed77c7407c94e7d2baa SHA-256: c6438c974b2885790243ab42ed1b83172596f5404c2b996a88b293333b4777bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://keluargamimpi.com/contents/files/86843854695.pdf In PDF document text
    • https://oklogistic.lv/upload/file/legogeduledebejemozipalej.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/sazepironawotelogugu.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/6874803982.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/95433686179.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/38654182708.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/3173909258.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631033270.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xawebagov.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/67760382651.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/fogesibusanadujaga.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/faluzopukuxo.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/87291386657.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dim7o7nfql6voi5umlk7ashgd3/dewizikunodujesal.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132231a34dc5---zemimobivafubakaterun.pdfIn PDF document text
    • https://clove7.com/userfiles/file/37302337494.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/72010251732.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/74357854615.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xobux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+record+on+my+tabletPDF 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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 18000 bytes
SHA-256: 962d6bcefab49dcd4c70db99acd021513ff173ae801d528b2c5d28dc92f2c1da
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 10604 bytes
SHA-256: d46f32ce99f06fa4a93783c810a44832d434a06e758e35458d6bfeb22b9f2c64