Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b51e2ac49ad0b40…

MALICIOUS

PDF

87.2 KB Created: 2021-03-31 01:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5afead4bb7057a38f7d458cb77be1d60 SHA-1: 2217abe253c8a65472aae497db298adf651968db SHA-256: 0b51e2ac49ad0b40fe26bc170e2b5a7f287639f711abf0407177a0c3ce0e8b47
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings indicate a pattern of distributing or linking to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://soxebez.ru/wix?keyword=windstream+state+college+channel+guide
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fd997bbf37c9.pdf
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/retetali_zirekejobo_betifagorimumo.pdf
    • http://stylecurtains.com/alphabet_grec_prononciationirbis.pdf
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/812e30412f92ff0.pdf
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5ffe6a4d6080a.pdf
    • http://gimemuwet.mypressonline.com/zavofivafanewavu.pdf
    • http://haifaiv.ru/460545039699wg4m.pdf
    • http://takipleskazan.org/55196393998crcll.pdf
    • https://static.s123-cdn-static.com/uploads/4384050/normal_6003875febd9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dokudaruriwiv.atwebpages.com/ryobi_bench_top_drill_press_parts.pdf
    • https://s3.amazonaws.com/fewunadupop/how_the_holy_spirit_is_god.pdf
    • https://s3.amazonaws.com/gimisorixosu/bidunivinimidakunovovuxur.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/tinuxevarubojasefatuzat.pdf
    • https://s3.amazonaws.com/lusabifef/tisaxiboxununivugubas.pdf
    • https://s3.amazonaws.com/fenatagazise/aankh_maare_hd_video_song_free.pdf
    • https://s3.amazonaws.com/vaxebisapesi/active_directory_administrator_interview_questions_answers.pdf
    • http://guriseb.myartsonline.com/assembly_language_definition.pdf
    • https://s3.amazonaws.com/dukexajuj/xamezig.pdf
    • https://s3.amazonaws.com/vipuxafol/header_template_html_css.pdf
    • https://s3.amazonaws.com/xedewofuretujo/harry_potter_quiz_house_and_patronus.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_off0001153c.bin
c8af4896e1aa953458869c919c6ccc54b27da97b6cacb85285327331b0697d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 5364 bytes
font_01_sfnt_off0001275c.bin
57f221802c9f84d5402c02d0b2078cbf672057e6684c6ccc9ae3ff4c304fb236
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 11252 bytes