Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d52e5688bf2e972…

MALICIOUS

PDF

65.3 KB Created: 2021-02-10 21:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70c851704b4be047de265b8a1c62d89b SHA-1: 38d72bb0aba21de405482a4efc391512c45e3d7a SHA-256: 8d52e5688bf2e972b6d754b376901fcfb94401bb3ea706e23514d508b4972dd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jottigo.ru/wb?keyword=accuse%20formally%20crossword%20solver', suggests a lure related to a crossword solver. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wb?keyword=accuse%20formally%20crossword%20solver PDF link annotation
    • https://koxofekidoponu.weebly.com/uploads/1/3/3/9/133997415/45b8bb2.pdfIn PDF document text
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/fovidemezedidezuf.pdfIn PDF document text
    • https://nazokorebuvawir.weebly.com/uploads/1/3/0/7/130776058/fiwolo-kurun.pdfIn PDF document text
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/gororazazat-xawupajipaw-navetod-rewotub.pdfIn PDF document text
    • http://monongzhlh.space/quantum_q6_edge_service_manualitarp.pdfIn PDF document text
    • https://melezejezoman.weebly.com/uploads/1/3/5/3/135383670/rupolawivoji.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/tisopa_rofufit_pukomuwa.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/a3b183985588c.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/rafakumatazuvamebaze.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/mivozanib_fuduxet_runigesu_suxofekigiwaja.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/9c5353a4bc.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/590629.pdfIn PDF document text
    • http://biomaniks.website/bazooka_boy_level_437_stucku9cw0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/advanced_bat_to_exe_converter_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/hocus_pocus_movie_trivia_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/eureka_math_8th_grade_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/odia_album_ringtone_2019.pdfIn 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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 5408 bytes
SHA-256: 28ddea234bff1010b8c95bc792665230f3686a04b3b1c39c5224139caeadd652
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 9844 bytes
SHA-256: 2d62b99f19bfe8e4367b604332ec4896a0ae8df6064322ba71b011ee5a05d0c1

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