Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457ecbbed9516cc…

MALICIOUS

PDF

79.5 KB Created: 2021-02-20 01:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7d2036477ecedcfed28c51330543694 SHA-1: d89e5996596c4b8e3d655e82375da6305f3ae054 SHA-256: 4457ecbbed9516ccd19f17827b549a8b47ec1c19a9e713b05bfea473b6feaae7
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, identified by the PDF_URI heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'Hitchhiker's Guide to the Galaxy', likely to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

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/wb?keyword=hitchhiker PDF link annotation
    • http://remontnatali.ru/identify_three_examples_of_bismarcks_use_of_realpolitiky1fj3.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/e2a19a00cf9e5a5.pdfIn PDF document text
    • http://bottlechainworld.com/lotro_beorning_guide_20187go77.pdfIn PDF document text
    • http://datinge.site/wexatikijigilumzm5l7.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/sekobugetiwomil.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/glow_worm_poem_by_nicholas_horsburght1nzm.pdfIn PDF document text
    • http://formulamoney.top/jukufarolaxoffawxi.pdfIn PDF document text
    • http://nipojugotav.iblogger.org/chhattisgarhi_comedy_video_free.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/5052203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6014be9f7230d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomuvoxibi.epizy.com/manual_blender_2._79_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/teduboxesa.pdfIn PDF document text
    • http://rigelosatabureb.epizy.com/broad_bean_planting_guide.pdfIn PDF document text
    • http://bunopudo.rf.gd/cag_full_form_in_medical.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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 6004 bytes
SHA-256: debbc0c781465a106b5966dd166fe9c6a84bccfef4ea84759b92f65b08356dbb
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 10584 bytes
SHA-256: c2efaf069b9d6da2f84b55d7580baa7fb297516399dc5bf1492476f29f08cbb3

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