Malicious PDF — malware analysis report

Static analysis result for SHA-256 103df00b557291b5…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 17:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a9d76430e22488fbcb67769417a57df SHA-1: de54386060a5b61bc612450ce982d92d27affcc2 SHA-256: 103df00b557291b5c250595c289c8d845a63e3eadfcf244f5bb1e185318bdf56
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains multiple embedded URLs, one of which is flagged as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download a secondary payload. The document body, though heavily obfuscated, appears to be a lure related to academic content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=acids+bases+and+salts+mcqs+pdf PDF link annotation
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/kibikejerafu_fogafi.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/ihTY41K/83735229703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420608/normal_5ffde5c08d42c.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/3eae98f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5fee3a3f51df4.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/iHjcQMu/diversify_portfolio_definition.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/17d38.pdfIn PDF document text
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/6189843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_5ff78ead49619.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/algebraic_manipulation_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/gdmnEkj/how_to_play_spades_with_3_people.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/EjcFGie/smash_cake_toy_story.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/3987606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370270/normal_60023cdb6a536.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/6506922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe5cf6b7a253.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/4194435.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/kavifunaruvi/lender_not_on_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/gokirezisaritunatav.pdfIn PDF document text
    • http://zasipafan.epizy.com/rudereger.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/vutizexamebopokibos.pdfIn PDF document text
    • http://boboxivelo.epizy.com/what_is_the_current_iso_9001_standard.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 5460 bytes
SHA-256: d80467fd2812be2b3260026606ea5b15d1e00fe4dc7b98f20d6a8e56bd357f69
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10060 bytes
SHA-256: 57f7f6e726edcd84d4da1b4d8f6f3aeb6de40506b88811be0b6cc74e137a4eb9

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