Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67430f966969357…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 00:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9357673821c19001fc59f402770a1267 SHA-1: c7194db358743e4905293d6ef1e6ad90be763328 SHA-256: f67430f96696935771f0b855e25ad797160b9af922d5eb2448b4cefb99c55d0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using disposable hosting for a large number of links, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://murito.fr/ckfinder/userfiles/files/zikaleveme.pdf In PDF document text
    • https://chungangroup.com/uploads/files/202109191448197423.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/10637052509.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/84953176976.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/monotedinisoded.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/wefaterezuridobopokodusu.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210915_D4C28B548A44B7D7.pdfIn PDF document text
    • http://apvn.info/userfiles/file/vogojidodegibix.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/webijaxel.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///17276273436.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23312118355.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/45818297694.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/90890402536.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/bikerotebakobasasiw.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/pumof.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/noluvulizakakejititoda.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161376f1451e4e---nesulunokizidesepukideru.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/deruvozowododufulupedo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/6683510208.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/85231154225.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nuzogojifivamuleb.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d42389f62a0228367933c043cee06ddf/tunukefajezaxofedurobow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+free+web+series+appPDF 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_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10620 bytes
SHA-256: e6419187b80e842d3d8640876aa48a0492aee4d54df3d0f4eca74a0d589ebf73
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 18244 bytes
SHA-256: 82da48deff68fdb29e35367bb719ffe06baf660cdd2f2737ad64ce71c447ca83