Malicious PDF — malware analysis report

Static analysis result for SHA-256 9296ca5f5b898c81…

MALICIOUS

PDF

84.5 KB Created: 2021-03-14 13:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 82c5948e1ea80ff2bc0237274df2b80f SHA-1: 9bc1a4dcfc70f48289960f40e9573b69f916ebe0 SHA-256: 9296ca5f5b898c814665cdb93c1820aa0699a042e9b50fa90e6b97bafba473e0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it's designed to trick users into visiting external sites, likely under the guise of providing content like a book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=escape+from+camp+14+read+online+free PDF link annotation
    • http://antonio-ita.space/mukudibetetezobux7kwgy.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/best_book_for_gate_mechanical_engineering_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe2d2bfe96bc.pdfIn PDF document text
    • http://nextauto02.ru/dmbok_free_downloadgaad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369773/normal_5fcc2ea34bf57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_5ff07dc91823b.pdfIn PDF document text
    • http://masterpowerpoint.com/polasexawi3csmy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_00260208274f465d8e115107de247c3e.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_346c24c654c24a5a981aa03249bde99b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/bengali_movie_sultan_trailer.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/the_looking_glass_wars_books_a_million.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/21325457849.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/kopasamumevukusawop.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_477be73679294d3f9e120a5b8b2f2eb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/24389976763.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_7ea4d63f7c0a40b9bfa90203ebea1065.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/google_maps_platform_billing.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 5396 bytes
SHA-256: a6cbd71b58997470a58724094646fef3009d6a787925d749ab3b670cd2f8f2fa
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 11156 bytes
SHA-256: 9e0f627b7b5e2ee2066de5d960e953eb0d9eb60280291739a28a0973195634f3

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