Malicious PDF — malware analysis report

Static analysis result for SHA-256 998997aaf0d41fd1…

MALICIOUS

PDF

278.1 KB Created: 2020-12-26 15:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b832eb27e3ac00b8e14321926b800715 SHA-1: 9700c0f4e6d804317f34b4818e1e119abe091545 SHA-256: 998997aaf0d41fd1ec75d376b60e0ec19ca57d1bb0e52e8e647b373db798d7e0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=interpersonal+communication+competence+inventory In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5fdd403f58375.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/powen-kiwitovijin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f8cb3ba9dcca.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/rapupikevunez-vasiruze-rejovirararox-pewakeniji.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/e67c1a92.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/sibejif.pdfIn PDF document text
    • https://sonuboguf.weebly.com/uploads/1/3/4/3/134310015/kezotopidiguw_vezewuwuneropi.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/tofaratememu-jikimemiloda-jowig.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/zabodetajozojux.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/43472369239.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/98651926627.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/razemoposafa.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/sorunaledaxijet.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/galaxy_note_9_amazon_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/coventry_public_schools_ri.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00040b79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40B79 34096 bytes
SHA-256: e8bff763f3034cdfd622d6fe26a3c2019a9bcfc9b6c4bb4ffd6d6dd52a874f1c
font_00_sfnt_off0003cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3CB01 1692 bytes
SHA-256: 1d66025a6b58bdf43a247c791eac06a957cfe67e7a6ac738881cbf78bf55c18b
font_01_sfnt_off0003d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D35C 5176 bytes
SHA-256: e2c54df57a03d8a328c8547a1284f3a1355c2588fdd851776c2e1d60d895cfa2
font_02_sfnt_off0003e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E4EC 11472 bytes
SHA-256: 8805e153ce97c41ae1f528e5890e12fb8d5eebc44aaa61008b57ab06715467dc

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