Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac6944e5f34d16b…

MALICIOUS

PDF

71.6 KB Created: 2021-02-12 04:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 264048583f677d4956bd241afacda650 SHA-1: c215699411c2011311b6ef13139b38091fdcffff SHA-256: 8ac6944e5f34d16b910df5bbbdca9b8f1469773ad7cdf2ef4089ec50e97b852a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Kearny mesa high school schedule' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The presence of multiple embedded and external URLs, including one pointing to 'bologen.ru', indicates the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=kearny+mesa+high+school+schedule PDF link annotation
    • http://form-copyrightservices.com/lotubatowegexowanagijozapgalg3.pdfIn PDF document text
    • http://detonic-italy.website/nenedudakozubirulantubq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5fdc51b51bebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_5fd29589c4fdc.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/nanasulegumazidanisej1fpi.pdfIn PDF document text
    • http://winnerslm.space/155814893656ydir.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/2fbe65a459ce99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6024123320e23.pdfIn PDF document text
    • http://henrysavbr.site/mojofewelezizonoltx6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_6004ac7e11d6b.pdfIn PDF document text
    • http://artdebug.site/witeromotokatodizitawadub8cr6e.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/dabatisew/karel_apek_r._u._r.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/template_jas_wanita_png.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/sokefolumavak.pdfIn PDF document text
    • http://vefugiw.epizy.com/comcast_tv_guide_listings_for_tonight.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/80781387904.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/towidag.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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5424 bytes
SHA-256: 0ccf649ab62ec1da071865fa3a0f4260c4b7ae222d23cd2bdb6ad6d16b1e32be
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10688 bytes
SHA-256: cb15149a89337af44fef0166a2bc05b18eeb75bb7d9eda04327a987c7df7a34d

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