Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc9b192ab165138…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a738622ced289f6c9dbad5dba4646d0b SHA-1: 022e2b795b6656012e49e185a722e30285a67ba2 SHA-256: 1dc9b192ab1651384386d0410af5d4d4aa5f8673c38a868f19c462c122497240
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the true malicious destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this, indicating a tactic to evade detection. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/maxakaxeditetorolotosebox.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/bufepixux.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zevomi.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/kusoga.pdfIn PDF document text
    • https://isleo.com/i_photos/file/89729316321.pdfIn PDF document text
    • http://pbpharm.com/upload/files/64695798497.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/58448049007.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/gumaludaximorudus.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/pinulozabaxerutak.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/25261859399.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090808334373499.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/11770448933.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210901_B20F22408FC50794.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/40673449660.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/20478387643.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/95708353118.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061816331978.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.pdfIn PDF document text
    • http://kammed.com/userfiles/file/pevazofolasobe.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210911080042.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/28725072139.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/vanolajipujukovupo.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/8553345049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=update+sony+xperia+m2PDF 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 18764 bytes
SHA-256: 6f5766dc373ff8dcdcd3d10141c7adc1ba15d668e61996baf18ab333fcd22d21
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10848 bytes
SHA-256: 790dca278e05d84a042eecf2a5f69a960c38cce3c8e54ce8712a339136cdbb9a
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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