Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b6454258d21157…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92b545354398372d60bc97a052409c8b SHA-1: f995a1b41b87f4fa9024cf0614b28840efd45496 SHA-256: 70b6454258d2115714a0ee11fc93fb8ef57bb2fa032ef9ab928fcbe5d45a97a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded links are consistent with attempts to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=how+to+remove+safe+mode+off+your+phone PDF link annotation
    • http://stark-tools.ru/images/uploaded/15683278502.pdfIn PDF document text
    • http://vit-physio.de/file/24088903841.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/19817950749.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/fawibexosipibeditomege.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a885fe8805---sunubupepesuvopevumuxutum.pdfIn PDF document text
    • http://xsteelstock.com/d/files/timawapufidiwigow.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/tutijoledazovaral.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/soforepuzatijuda.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/woripatogaxuxifewabo.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/bokiga.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vedoxegebaripimixagufuf.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/26595265083.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/pumox.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905173548.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/49929346168.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/fidunuj.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67897723858.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/82124918844.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910065147.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/92136052554.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/larejotabisusizejoxuji.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/51800676539.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090312274028.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/gadijuvizetuvusojifaju.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366f1e2295a---zanesoxax.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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 18408 bytes
SHA-256: b403921c50a039409497cf32261a640040be72f36dd155991fc9829c1eae05ef
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10980 bytes
SHA-256: 17f91d00d9e623d210526523ee98ed4ce31e302a95a6546b42b18d6aaeab59a5
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1