Malicious PDF — malware analysis report

Static analysis result for SHA-256 adefbdc42f238001…

MALICIOUS

PDF

77.1 KB Created: 2021-02-11 21:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4c080abb25899ed9ae9cbb27e162dd94 SHA-1: 69880060af0548b0fdbdbc6b711280becddf4a02 SHA-256: adefbdc42f238001a8c56e09db643bfe421473b10e75ae5237b004842ea64059
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'jacksth.ru', which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an 'ionic bonding worksheet answer key'. No scripts were extracted, but the presence of embedded URLs and the nature of the detection suggest it's designed to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=chemthink%20ionic%20bonding%20worksheet%20answer%20key PDF link annotation
    • http://e-devletodeme.net/57489505730r63pt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5fc999bdade28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fe3534e02205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60201949070f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5fff12497615d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5ff782f5edafb.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/42935946.pdfIn PDF document text
    • http://mkr-olimp.info/microwave_coplanar_waveguide_simulationbm9hd.pdfIn PDF document text
    • http://thefortykuti.com/lirik_lagu_didi_and_friends_mengantuknya_mumiazru7a.pdfIn PDF document text
    • http://ribupisid.22web.org/52468051485.pdfIn PDF document text
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/b2fa6da4827de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcdf9c0e9aeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff1541e76cda.pdfIn PDF document text
    • http://erethiztzj.space/adobe_reader_free_old_version6ovze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_602333013b0ba.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/d296aff69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_60065da1850db.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://vojuzegi.epizy.com/aparichit_movie_2005.pdfIn PDF document text
    • http://vezoxonu.epizy.com/fulupovono.pdfIn PDF document text
    • http://lukigek.rf.gd/vunuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 5532 bytes
SHA-256: 225d1a4e391ddbdc56319cc4e8f6c68dad0161c567a8bcd8ebade23ed03d4112
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10804 bytes
SHA-256: 50b069e083d1cb6f48f4bf720ca2c984e444d252b0af36d0955673f673144eed
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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