Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9994cd88a4ccf35…

MALICIOUS

PDF

82.6 KB Created: 2021-10-05 21:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94e90c189c0466b9b1a7a302723969c7 SHA-1: 88748daebaad509de39f031a058815624b1d295e SHA-256: b9994cd88a4ccf35a7ea92857208fe7eb8b319226b54347d60c471afe0109cb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://galaxytraining.examinationonline.com/files/vonuwarabuj.pdf In PDF document text
    • https://panelshock.com/userfiles/file/mazemu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/2289448476.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/75785037423.pdfIn PDF document text
    • http://uhorder.com/upload/files/77984367778.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/vufedilat.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/93099018141.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/98037873130.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fininitemunu.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/35415474416.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/92817475396.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/pepomeludesejijuxowo.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/67306537331.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/36022324337.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/43031549c2ea343281940e0c8de4a312/gilonudenubogasoguwuj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614566108390f---93601583658.pdfIn PDF document text
    • https://avela.md/userfiles/file/35307669007.pdfIn PDF document text
    • https://nls.vn/upload/files/81773399773.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/2665359411.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/51989190616.pdfIn PDF document text
    • http://mimpiindah168.com/contents/files/duwibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=poor+thing+grenache+2016PDF 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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 18680 bytes
SHA-256: 46a289e5f5e7aa80acdc47778eb555800ad03efd776f62d0445af46746352f48
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 10756 bytes
SHA-256: 8e5ad0c02d3e0a08fa2c2b313143cde8f4949d4a759b288b0786a287e4e53746
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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