Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60ffcdef307b421…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6c43166f8fda1bdc8a73cdb21a3955a SHA-1: 3f4807914d7ca291b1a748ccb0e55c294c46d091 SHA-256: f60ffcdef307b421553e8277875f4ee82244d2bc824ebab2069cee2496b37253
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=bill+cosby+game PDF link annotation
    • https://medbioplast.com/klucharnet/images/file/13936792283.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/70042384881.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/fupetod.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kiduv.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49621984366.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zelijip.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/59115335513.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/9505401545.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tobexagot.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zifas.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nekogajigi.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/kagadapit.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/tomoxifunu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210910_115232_4261.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/mubumedisope.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/tebuva.pdfIn PDF document text
    • http://medi-sen.com/files/files/56095206853.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/60991675190.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/ximug.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/nenugit.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/73072329908.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/kipejitewuvobigaditaropev.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613343ee0ec89---32447020511.pdfIn PDF document text
    • https://webmenuplus.com/images/file/57557221556.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/rudarozowaxas.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/msertr80ecvc24vmuugcfv98j7/46872131997.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10580 bytes
SHA-256: d728d38bbb8656f0dadff34779a40974686a675cc844b2efcab943816b32f995
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 19100 bytes
SHA-256: b2d857ad90248c4f373a59b1b8ccdf5d2f24025fdeacd84d013559f462700ad5
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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