Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52f081f3d063999…

MALICIOUS

PDF

91.6 KB Created: 2021-03-27 22:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3b8687fc6d71b1bd3a3565888c7acc SHA-1: 5105f27c5b63b2895d4cd0813985000a95f15bd2 SHA-256: b52f081f3d0639999aed5d4017f70aa1dfb563816e5df5368afbabb114a890a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=knapp+commission+report+pdf
    • https://robedovetukurur.weebly.com/uploads/1/3/4/7/134754045/79c160d.pdf
    • http://sewukagazub.mypressonline.com/zesidimorixo.pdf
    • http://fulokixowo.scienceontheweb.net/derufizaraxurukebamaziga.pdf
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/fumefobufejikironebo.pdf
    • http://polobasopika.mywebcommunity.org/95017332230.pdf
    • https://nonizevotete.weebly.com/uploads/1/3/1/3/131384281/jedaxisigifumima.pdf
    • http://vukogosapejofa.iblogger.org/altium_designer_18_crack_free.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/gasoduwapoxod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c8df9bc-51ab-4534-98f2-66a68b235a63/13536167052.pdf
    • http://tofujuwo.onlinewebshop.net/appareillage_electrique_basse_tension.pdf
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_909470f95ea94aef9a94852499ec2032.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d91510e4-5e19-4a1c-aa54-b14e6e5e48a1/lemegovixamematifiwinisi.pdf
    • https://uploads.strikinglycdn.com/files/39ae09d1-9d77-49c7-832e-4a2f6ff88c60/convict_conditioning_2.pdf
    • https://uploads.strikinglycdn.com/files/7a1a3d01-a502-4244-aae3-291609a6c632/50051880923.pdf
    • https://uploads.strikinglycdn.com/files/a1610e38-2768-4f08-97bb-69bb7cd27277/kigamoxebezar.pdf
    • https://uploads.strikinglycdn.com/files/5a2214d7-a0fb-416a-b27c-b1135f04df76/tunogo.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_abb946e866c74f3494aa83ea55d89762.pdf?index=true
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_1268e7577b214c75846b3ef5a3c0ebd6.pdf?index=true
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_a5c0baa2c52546f9853b310402ee042d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccdbc47c-39d6-48ee-b32a-7e8326061d45/lurudikokek.pdf
    • https://uploads.strikinglycdn.com/files/73dac69a-fb10-405e-b4a4-e1a1e72f16b2/free_online_machine_learning_course_by_stanford_university_via_coursera.pdf
    • https://uploads.strikinglycdn.com/files/58878051-8064-4de8-917e-4a1a99a9f26f/percy_jackson_3_story.pdf
    • https://uploads.strikinglycdn.com/files/3e1f205b-524f-4ed5-a800-07287a47f19d/fundamentals_of_social_research_methods_an_african_perspective_5th_edition.pdf
    • http://ruxexomiromijos.rf.gd/halo_beyonce_piano_sheet_music.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_off0001299a.bin
201f954aeeb740ff63c1fe187358cf7ced0165b6d0c2f11a45e82aec32658b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 5240 bytes
font_01_sfnt_off00013b59.bin
0662b9dc74185459927e381c169bd56a5ad1d5ec12691924439adcd885bad48e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B59 11132 bytes

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