Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4bff9872d215c6…

MALICIOUS

PDF

78.7 KB Created: 2021-02-28 13:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2a7f3af53879187995ce7056c537a19c SHA-1: 33ce7e674fb840e5a2b4a560aca7eae83d867d3b SHA-256: cc4bff9872d215c6ee857f21a3705bbbdc253fd4ebffdcf12381bf76623f8ac7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

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://dugedepap.ru/wix?keyword=briggs+%2526+stratton+675+series+manual PDF link annotation
    • http://reform-st.ru/todibineniplhr5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370294/normal_5febef10a9fbe.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/mekofexitinobekjst0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60153db86665d.pdfIn PDF document text
    • http://ita-women.space/evca_reporting_guidelinesedulw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5fc9b0b78cd4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5ff54ed0a228e.pdfIn PDF document text
    • http://deflecfcvy.best/how_to_start_a_central_ideappyw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_602267b92e797.pdfIn PDF document text
    • http://triple-doska4.club/sultan_movie_online_watch_free_hd_hotstar6aewh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6019f1010d758.pdfIn PDF document text
    • http://theporte.xyz/tutubedavilavudo8rdax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/cbt_worksheets_for_separation_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/bejeweled_for_pc_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/14427752527.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/school_uniforms_articles_for_students.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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 4656 bytes
SHA-256: fffbfd8af75ff41da9b348ff977459b00c2a72a6df23241f9c5f7f68f112cb6a
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10420 bytes
SHA-256: c51d4132e37887afa1caa973efdd0a6f88dd3fc4c51033ae3d62ecdf94fb857e

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