Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc72ffb9ed384460…

MALICIOUS

PDF

138.6 KB Created: 2021-03-15 08:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf21feef4f2596c49aa7d255b8c1bf8 SHA-1: dc21c22e8400276e928a983704d3484e01e51eb3 SHA-256: fc72ffb9ed3844607df19a57d45484dcec539dda9b93e18d7189e0dd45534996
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary URL being `https://soxebez.ru/wix?keyword=steve+blades+worksheet`. This suggests a phishing or link-farming attack pattern. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=steve+blades+worksheet
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/ffbae8.pdf
    • https://cdn.sqhk.co/divojimo/PZeChd3/sharkbite_plumbing_fittings_removal.pdf
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/522e3b80aa.pdf
    • https://cdn.sqhk.co/jogekiluse/haichja/xufuzaxagisazuxix.pdf
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/tefajadeno.pdf
    • https://cdn.sqhk.co/rivinodati/hezfhiW/58865860996.pdf
    • https://gigexozokup.weebly.com/uploads/1/3/2/6/132695408/5492801.pdf
    • https://cdn.sqhk.co/ripowusaro/gjXpHji/jamawibibed.pdf
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/2f7e0.pdf
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fff52d72e572.pdf
    • https://static.s123-cdn-static.com/uploads/4404730/normal_5fcf3c62a43df.pdf
    • https://cdn.sqhk.co/juvanejejuwo/ieHhyii/dead_cells_map_2._0.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_32882a21bbd24d91ba5f895e92a8659c.pdf?index=true
    • http://kuxoxokazutuv.myartsonline.com/knights_of_the_old_republic_xbox_one_s.pdf
    • http://nimanexobubibub.onlinewebshop.net/70812721701.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_4c5bacd43e054cbf975ffab60edf2d84.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_bf0796fe82804293b7c756695add7420.pdf?index=true
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_75e3c14159b14366a9429d7e84114a60.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_35dfe4f3d6e34ba78c0852356ce5f054.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d6fb.bin
788b2d71ff3811d06c89a0fe745fe3172722ffbad2e37106f6af211d8b8feffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6FB 4864 bytes
font_01_sfnt_off0001e76f.bin
24ac2ed89168e304a7bd301201c0bfc7bd8a97899c686d819654cf1825a732f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E76F 5372 bytes
font_02_sfnt_off0001f9bf.bin
437ebf1278a99cec285d9a545af6d5b76483a1456d3d4574e9adb980a817ee0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9BF 10440 bytes

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