Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf343e0197cd696…

MALICIOUS

PDF

69.8 KB Created: 2021-02-14 08:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb24d1a93f5ec30535e4b10f9ba4580c SHA-1: cd39aa6b7e14414e650d2c617a23f61074d7441a SHA-256: acf343e0197cd696a29e7da2b79056b55d3cc60aec7ce58e9d7c0a125e0280bc
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL disguised as a homework answer key. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wix?keyword=practice+and+homework+lesson+7.2+answers+5th+grade PDF link annotation
    • https://cdn.sqhk.co/zisubiziwu/hehfzha/95346223094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_60156539aab2e.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/6186ceff.pdfIn PDF document text
    • http://tdsevsvet.ru/nubawufurolosezobukev6ckvf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5ff088659ae5b.pdfIn PDF document text
    • http://d-youtube.com/tumulunowapybjp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff694650ebe6.pdfIn PDF document text
    • http://copyright-help-center.com/guia_consejo_tecnico_cuarta_sesion_2nagld.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/kozazixebufatej0z.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/hhuJFgc/67225825204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5ff862af427ec.pdfIn PDF document text
    • http://mp4.design/a_thousand_pieces_of_gold6hjjz.pdfIn PDF document text
    • http://makamar.online/bhojpuri_gana_dj_remix_mein0qets.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/gutefavusula_zibeveviloxuru.pdfIn PDF document text
    • http://lishop.site/162925895991xtn0.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/jjhji6C/metaphysics_masters_degree_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9eb852b27f.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/rhaSjdM/hill_climb_racing_2_moon_tricks_event.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 5664 bytes
SHA-256: 2b9b99e17317ae4b917b8845955f0b695828107ceba46951f9d085aa098a7d3c
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 10192 bytes
SHA-256: adf859c486b5379f5128390571302e9cbe095cc868f7b984ca8929e7dfe8f816
font_02_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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