Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8acaa4811cd43ce…

MALICIOUS

PDF

86.7 KB Created: 2021-04-04 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 01ea5fd91fd8636295e656d9caf31417 SHA-1: 53a69c448f634a71d75bd05dedb93184fa93aa52 SHA-256: b8acaa4811cd43ce4975a4830a63ae3d3c10c77494467c88d1234858d438f9cb
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, when visited, likely leads to a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to educational materials, aligning with spearphishing tactics.

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://jottigo.ru/award?keyword=b.+tech+electrical+engineering+syllabus+pdf PDF link annotation
    • http://megatorg.ru/varamupanibowamakudzak89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_6011e4ff6aadb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fef36a418df7.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/9idhjib/glymphatic_system_brain.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fff2a965480b.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/nintendo_3ds_games_codesrm5a0.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/igaAuie/noxazulujuwitoruw.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/ogfhfTQ/1649380468.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/6pjajgv/guide_pes_2019.pdfIn PDF document text
    • http://delaem-sami.online/257624232604yzhr.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/bagokiko/78912468795.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/pedagizebikewuletisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef13d178-2bba-4eca-a1df-31b47a1f9f56/50394715316.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/79858246130.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bionanotechnology_lessons_from_nature.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/busifeliwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd612fe-23bf-46ac-8023-39c86d216dab/vujumukene.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/carpal_tunnel_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/christmas_party_place_cards_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/fumijijovowuwozan.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_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 5740 bytes
SHA-256: 31c15235a0ae2492ab9974345737d44581a9616ec9b156b579cbc752fa5a0a3c
font_01_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 11668 bytes
SHA-256: 283b19cd8c866b8b2de1cf3521243ff0cd394a3c1df96c97d26275395a022059

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