Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90aab6506cc7bc4…

MALICIOUS

PDF

82.2 KB Created: 2021-04-07 22:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3a0b9dc4d5e1bde2d97a182d8ed13cc5 SHA-1: 92c99374d8c9cc35bf407b2be2ad577e52c21bbd SHA-256: b90aab6506cc7bc4dfcfb3b3903d9f11ea8ea183dc7e7e60ba5949224773898e
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 suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=tokyo+ghoul+manga+box+set+barnes+and+noble PDF link annotation
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/jibufekiguz.pdfIn PDF document text
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/4386372.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/e4gegeu/blockly_games_maze_10_solution.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/94254931658.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/buffer_solution_problems_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/Dbha3tk/movies_free_full_hd-_watch_free_2019_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fcbabe75648f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_605895cae819e.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/igib74z/bedroom_furniture_sets_queen_white.pdfIn PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/basokoz.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/adversus_haereses_san_ireneo.pdfIn PDF document text
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/xubelowozi.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/bopuxosavubare/48211522535.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/product_catalog_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/sarebolirevadoguledaxeno.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/samsung_xpress_c480fw_toner_original.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/cara_avatar_musik_di_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/gagiruzapobepeg.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/74215581883.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/sifole.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/movegida.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/kavujukuwame.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 5564 bytes
SHA-256: 47f99b90b2ffb8daca5c2a257f3ba44ce8ef1dcb3e0991a4d67804e4ba3fb796
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10736 bytes
SHA-256: 3d5bcac036095605905f389800f00b266b2754eae1fdc7dd8e4f10eb2836f131
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16172 bytes
SHA-256: d64bc6380e0eaa1176cac3164d67defa127098331a48f6beb6813acb26cb21ee

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