Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27875387ce37724…

MALICIOUS

PDF

79.4 KB Created: 2021-04-22 00:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26124098a3dda88489689af2139a6165 SHA-1: 773d724743617ac4cbcaa344819b4ccc4b987dc2 SHA-256: d27875387ce37724b67af5704eaefad4237724a564aae1321c27989a0b13a8fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM specifically flags the presence of a mass external link farm within the PDF. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=how+to+set+up+swann+security+camera+to+wifi
    • http://vienvozvrat.site/romujunodilop9k25u.pdf
    • http://nibewubixela.getenjoyment.net/xitasufirilowibug.pdf
    • http://italylife.pro/22172927475ukhgp.pdf
    • http://zaxiluxedexu.getenjoyment.net/8932566206.pdf
    • http://punavuvipufov.sportsontheweb.net/7555577431.pdf
    • http://yognat.space/zitawakebaxevipisu6go.pdf
    • http://jewlgems.com/gamergreen_player_carddai2p.pdf
    • http://epaytds.xyz/64875887902hly5e.pdf
    • http://stopnutristrike.ru/lexaferopibuguwulip73q1k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_0dd3c1c004e34cb0a62b4fd21557b1fa.pdf?index=true
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_15f6f28bda8a4bf3a644283b0c3362ad.pdf?index=true
    • http://lojabupabavize.onlinewebshop.net/29932453091.pdf
    • https://s3.amazonaws.com/tikofaketonub/mufuzigopixefukegi.pdf
    • https://s3.amazonaws.com/sizabo/diccionario_bblico_nelson.pdf
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_295179599db44e4681301ce1e406b18e.pdf?index=true
    • https://s3.amazonaws.com/fivebo/identifying_congruent_and_similar_figures_worksheet.pdf
    • https://s3.amazonaws.com/fewunadupop/vamojebilidisenejatavipe.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_8e0a47c175c7491ca22d0d67ae250b3f.pdf?index=true
    • https://s3.amazonaws.com/lomuper/todes.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/repipige.pdf
    • https://s3.amazonaws.com/fajetufekejo/creating_artificial_reefs_reading_answer_key.pdf
    • https://s3.amazonaws.com/naxozelozude/what_is_the_moral_of_the_story_rikki_tikki_tavi.pdf
    • https://s3.amazonaws.com/tesodagiwor/zujunipemop.pdf
    • https://s3.amazonaws.com/vazisi/sea_fishing_rigs_ebay.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_off0000f930.bin
f001c79bd5197e43857ecb584d2e393ce3b4c68100aeed676eb9cfca921554c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 5284 bytes
font_01_sfnt_off00010b2e.bin
3ab114c83911c8f42d277157a785a31d8abc7d3cf28ad482c45555b574f09fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10856 bytes

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