Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39bcd9a0c3fe7fe…

MALICIOUS

PDF

73.6 KB Created: 2021-03-12 04:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef7cb4400765f5a6caeea89d0f9ba87f SHA-1: b14039909467ce693ebc34656803720e8c149c58 SHA-256: b39bcd9a0c3fe7fea091c1d2e4ee6ef810824682b0a046843662ed44af32cf7a
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=preface+to+samson+agonistes+pdf PDF link annotation
    • http://pollsexpert.com/ionic_and_covalent_bonds_worksheet_middle_schoolnmnam.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/14320918244.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/geometric_shapes_and_formulas.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/budigasiroxoziloxuj.pdfIn PDF document text
    • http://xenifizonuk.22web.org/how_to_get_answers_on_course_hero.pdfIn PDF document text
    • http://nonretloli.site/xpress_redi_set_go_price0sqok.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/cazadores_de_sombras_pelicula_completa_sub_espaol.pdfIn PDF document text
    • http://kiwemotoxug.22web.org/42487108125.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_long_to_cook_sweet_potatoes_whole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_b71f78de11ed43abb03bd19d386dd038.pdf?index=trueIn PDF document text
    • http://xewebumobodoris.rf.gd/glencoe_geometry_chapter_4-_1_answers.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/24948479794.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_552d50af8ee847ea9622309457928e1b.pdf?index=trueIn PDF document text
    • http://julivaradisakit.rf.gd/13031868581.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/arquitectura_neoclasica_en_francia.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_7c6241416cec4eee8fdb7142f9c930ac.pdf?index=trueIn PDF document text
    • http://lawewil.atwebpages.com/how_many_vowels_in_chinese.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_c4dc70bf8b3846458f69a6b8ca6843be.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 5444 bytes
SHA-256: 15a130b359f8d359f8dbc9726f130d669fc8845a2698d1d593a10f5f4d2142fe
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10456 bytes
SHA-256: 328db820914e8e4af57653683be7d47de49e085f59e45244d74e5aff193a6bac

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