Malicious PDF — malware analysis report

Static analysis result for SHA-256 a649ff557c82565a…

MALICIOUS

PDF

66.9 KB Created: 2021-02-20 17:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 618e8020fe64f8b841c2c9dfa160e526 SHA-1: 2f2051adec283f4c5070aff2124b7a4bb847535a SHA-256: a649ff557c82565acf16a7acece59af482b6e3dbe01de63509fb49c565128950
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an external URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of embedded URLs indicates an attempt to redirect the user to malicious content, likely a phishing page or a further stage of malware delivery.

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://seumenha.ru/123?utm_term=possessive+pronouns+worksheet+grade+6 PDF link annotation
    • https://cdn.sqhk.co/zolilobup/oqhelha/happy_birthday_cake_writing_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/Jhaiojj/80189077954.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/KheQeJK/messages_app_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/gjagjjc/bakatufowi.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jjhibih/opera_browser_video_downloader_extension.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_6014ab3a55742.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/nUieXDk/golun.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/9ggdhiA/gokazizozabapamuboluzod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60224f29b92c9.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/ghhcOYQ/supermii_cartoon_avatar_maker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/haqjbje/89951009034.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/Aja4Wje/wuvifukepow.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/guwutivupudutu/80270134656.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/18957278598.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/jurug.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/jarabutuvubasubelada.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 5560 bytes
SHA-256: 45868691190a323ef91d46581dbf58ef92f2b31059de60ff3b1f9a9713898af8
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10372 bytes
SHA-256: c1f99ad62399a2565ad865e102ba869a7a0c2e4323de28c1939bf83cb5f04adf

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