Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1753d5fdb59d30…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 20:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40536131ae23a607c3e639cbfe6f8a7e SHA-1: 87a8c6e5bf12ff1844c932b82faf2bc026913283 SHA-256: 9b1753d5fdb59d30d3f0345ca954df2d628cb0ddf1e8dc8f2f1fe5590ae806e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=positive+words+that+start+with+d+to+describe+a+person PDF link annotation
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/61696841610.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/viberututabogaf.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/46747794827.pdfIn PDF document text
    • http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/97445804772.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/nugokukexojifoz.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/49356230895.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/9746119730.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/tojegipepu.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210905_3783C625797A316B.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/potumemuziniwe.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/31986290240.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/bosokenelusefabosomow.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326d418e50b---50337016481.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754772637a---29562915268.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/84490586970.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/91704403692.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/86770252141.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/86755980540.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/diremiwapipavapopimes.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/54766797471.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632143407.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/50983341638.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 17968 bytes
SHA-256: dec3b05eeb26b78bdef474eead78c782271c4d8de1d94ea0ac23f2e5e34cbac6
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 10860 bytes
SHA-256: e2dfa5535fc8cb4ffde8665f391eb021d5a0bf91f86279f07ff8feff3cd1e856

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