Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e30e4bbcb5deec…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 15:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228e0455f5527fa7888d6219f0ccc428 SHA-1: dc46686146de727afb8cebeca7f3b6f7188a9104 SHA-256: b9e30e4bbcb5deeca9dc715c665bf04f372785fabff1e8b751a0409856a855b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://mezovuduw.ru/award?keyword=aerodynamics+2+notes+pdf', which is likely used to redirect users to further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=aerodynamics+2+notes+pdf
    • https://cdn.sqhk.co/bofagenined/fhfKCAo/hockey_games_near_me_next_week.pdf
    • https://cdn.sqhk.co/togareguko/gicuYib/jurassic_world_the_game_hybrid_pack.pdf
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/pezozovesagodomuxar.pdf
    • https://cdn.sqhk.co/bipujawojeli/8Ghgjgx/jeranekuwil.pdf
    • http://sutobep.getenjoyment.net/functional_skills_maths_level_1_past_papers.pdf
    • https://cdn.sqhk.co/tuturuno/NgjhjqL/93357444529.pdf
    • http://fexevewuli.mypressonline.com/17850453765.pdf
    • http://rajudadude.mygamesonline.org/assamese_alphabet.pdf
    • https://cdn.sqhk.co/defisepeniba/dRaWQJO/residence_inn_las_vegas_henderson.pdf
    • https://cdn.sqhk.co/bozawenibiwa/hgjpBhc/dog_puppy_wallpaper_download.pdf
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/titunimedidabu_sagikudunatu_novolejenu.pdf
    • https://cdn.sqhk.co/xugiwatokax/4ccCkgj/5087645182.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kugelilizibuwum/47421998382.pdf
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_3cb03c91b61145378603d2dd49ac410a.pdf?index=true
    • https://s3.amazonaws.com/folexapurilowe/legacy_of_the_drow_siege_of_darkness.pdf
    • https://s3.amazonaws.com/radubozufiwo/standard_enthalpy_change_of_combustion_propan-1-ol.pdf
    • http://forezepolutaju.onlinewebshop.net/electricidad_y_automatismos_elctricos.pdf
    • https://89e38ec3-4f9a-4901-8333-056bfd5bbc5c.filesusr.com/ugd/3df7a3_d235821b2a8444879ea166213f1546d1.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_40ac518557fd4fa5b1045c0bdd4f19f3.pdf?index=true
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_1c209c695cff4b01986a0443f60eba8c.pdf?index=true
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_3c15e1b6c5c642d3b6a794347594632c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73a.bin
a415b6d6f9f7c3657a7a4c66312788173d3e5355fd2958da53e7047d7dc63376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 5492 bytes
font_01_sfnt_off0000f9e1.bin
5e29ccd8ff41470ce5291560bc6dd1a655f215d2b9297f3b22d2f18eb0f0056f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 11108 bytes

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