Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2a7235d4e5e840…

MALICIOUS

PDF

77.2 KB Created: 2021-04-11 17:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e733739efda3cc9381e59d3828013df SHA-1: d4cd27dd2c595b7246eae72c8fb7f7b19fa2970f SHA-256: ee2a7235d4e5e840b575c0a08b8ba3d279b24ca2e7352211f9521713b70c4fcc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent URL pointing to 'jumiwimov.ru', suggesting a link farm or redirection to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=metal+gear+solid+3+boss+order
    • https://cdn.sqhk.co/mizipudi/d0p7ybS/88167774632.pdf
    • https://cdn.sqhk.co/reruzemafow/jP8I3xn/99208086619.pdf
    • https://cdn-cms.f-static.net/uploads/4405208/normal_6048266be142a.pdf
    • http://daravto18.ru/the_merchant_of_venice_book_download9ha1x.pdf
    • http://br1.red/solving_linear_equations_worksheetsm582.pdf
    • http://tegor.xyz/wuzuminamagznkgf.pdf
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5feb064d0fefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/neporezofov/conceptual_physics_chapter_4_exercises_answers.pdf
    • https://s3.amazonaws.com/dinisemowoge/79081233590.pdf
    • https://s3.amazonaws.com/visagogijulep/cibil_report_lss_meaning.pdf
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_d260fa785bde4807b76cb5b0e27ddce6.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_3b40ffa83f514d3abd9b2478e01f07e3.pdf?index=true
    • https://s3.amazonaws.com/dabatisew/alphabet_pronunciation_in_english_worksheets.pdf
    • https://s3.amazonaws.com/wezukep/12316326020.pdf
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_c45e4da3f87241ef9ae848294fdf3b93.pdf?index=true
    • https://s3.amazonaws.com/xewamejixolefaj/duel_links_reddit_beginner_guide.pdf
    • https://s3.amazonaws.com/tarajix/86193476881.pdf
    • https://s3.amazonaws.com/jedadokuti/scag_tiger_cub_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc7.bin
739f7183e4cbbc663e55425e2939581ff90bc919f414787a0bb1db603198d40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 5304 bytes
font_01_sfnt_off000101e5.bin
4be902960dd9d66634816970c870572f7369c622b505db809cb9db4f2a0844ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 10556 bytes

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