Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cebd514d38811a…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 06:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22c18168c46bfbfc3d3fcff08c91771d SHA-1: e8b9aef7bcf3d5f93deba4f398eeea21722719fc SHA-256: b8cebd514d38811a51563fdd81cd8707334c8ed0c3b8968a39366dab95089001
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 pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a machine learning classifier flagged it as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to quantitative research, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=que+es+plantear+el+problema+de+investigaci%25C3%25B3n+cuantitativa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5ff4998e14449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ff0f79fcbfc8.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/58083240193.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/dukof.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/ziloxile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_603956a634add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600aabf59a2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_601a2fcde4797.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/vojigikezinezurodopisod.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/sepovutapakogaf/34499830841.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/keynote_templates_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/46065247053.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/dumewipuvevaluw.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/1510793885.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/support_vector_machine_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/golmaal_golmaal_again_full_movie.pdfIn PDF document text
    • http://tutedenomazul.epizy.com/85503483485.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/maternity_leave_letter_template_teacher.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5792 bytes
SHA-256: 2d749be5f6e7e4f82930645ceea199bc74be5e44cf8b93d5b892a2a9302f2c90
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 11384 bytes
SHA-256: 5ed5043f5505b6bea602340b6062371e3339fc0d020f6339bf9f9c2d1c129787

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