Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d1011842bb9954…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 08:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d1fac8cce3e151844bb7e083f497182 SHA-1: 401b4e0f7d6cd5f1f9c07a8d401a3fb4d15ee81f SHA-256: 35d1011842bb995404228764adc457e6adf08f1e65af4b861383f0df2686ccfb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, some pointing to potentially disposable hosting, suggests a link farm or redirection mechanism intended to lead the user to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://charterboatdeliverance.com/uploads/files/84980018102.pdf In PDF document text
    • http://positiveforce.in/uploads/files/1418722816.pdfIn PDF document text
    • http://palami.by/images/file/birinulaluv.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5c8c38cd---47693766154.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41762094938.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/99012713083.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wefipipexag.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • http://mutitar.com/user_img/files/17799884896.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/gutixasirubobumixen.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/65980286700.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/fibamerajixepelizutulije.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/soxiretuwagolapoko.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/78669398139.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zepigisavokuf.pdfIn PDF document text
    • https://labelmarket.eu/data/file/fororiwudadiweg.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fijomumarugavinone.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/tiwexibemesef.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/vaxizol.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/govofuvoga.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/93623178061436af15cc88.pdfIn PDF document text
    • https://websbag.com/uploads/files/23662880259.pdfIn PDF document text
    • http://baove247.org/upload/files/36206803824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kissanime+latest+apkPDF 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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 18924 bytes
SHA-256: 849a7881d3b960d2ea15be697d4f8237d7d7bfc833f5a4683d6f790e7d60b416
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 10276 bytes
SHA-256: 229c8192d198dfdc7c8ede274ded59ffee9dc2a07b8e6413c533b400cb60812e

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