Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbe69190459c7db…

MALICIOUS

PDF

68.3 KB Created: 2020-12-16 17:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb8b3cb948b35078d6a4bb08fb21ecbd SHA-1: 3120b85678614cb4407c482bb39d1e657cf5a07f SHA-256: 9cbe69190459c7db34ec7e33f5d6a2b3b196dba0c1f3b6663a0175134f16d7b6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. It contains an embedded URI pointing to 'traffset.ru', suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to '1950s worksheets for kindergarten', aligning with a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=1950s+worksheets+for+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fb5bb5dd92cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497344/normal_5fcaa8edb025d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5f9e6a0407743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd26141d74b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fad7e235d2fa.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/ninasivol/fraction_review_worksheet_for_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/791589505.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65124df132613bbe271c4/t/5fd652dddca22152603f875c/1607881437451/25763331929.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/rupusizijivoguvapifarug.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/gelole.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/90134074661.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c991c6d9645836219624/t/5fc0f0099d79364840af3370/1606479881998/43516755968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad5e9a3-d382-49f1-80dd-847fe5e38d66/tevamemi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc31c7792c50b1a1e85f0fa/t/5fd05401ab2d482295db3ec0/1607488513663/99891334925.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/27241626939.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38b1e9698b02c7f3141e7/t/5fd2174db0f0f842d7ad9432/1607604046554/street_legal_racing_cars_for_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5875b239b072291509c32/t/5fd6550272b1137fa97402f0/1607881987002/vumuxavigawuradexezenum.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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 5672 bytes
SHA-256: 9a4c142a1ddd5edd490d8b7a17b95240264c911398cab55a6198d8fc716c7e39
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10004 bytes
SHA-256: 69cca274ef9ac5b61dacd6bceafbf1985ae22effedac9deca60d743580bef6d6

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