Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b502a31b1267c…

MALICIOUS

PDF

75.2 KB Created: 2020-11-13 22:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e0bb6d39602750c2846c36b7316edb7f SHA-1: 1b88e3788ce5e33f61419bf31fba141f74741bb6 SHA-256: 1a5b502a31b1267c2018ff249164c139ee0a146e6c4bdd35205bf0e503e57fa8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?utm_term=yonsei+korean+textbook+pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The document body, though heavily obfuscated, suggests a lure related to a 'Yonsei korean textbook pdf'. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious phishing or download attempt.

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
  • 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=yonsei+korean+textbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f89c8cdd2efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5fae0f01bc3bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f98e5b493f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f95204eb111e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f901ce9878d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5faa72f44a830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5f99a5d536c96.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/wepeliniru/golden_retriever_and_labrador_mix_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/samirovujabu.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/webelos_into_the_woods_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/34503741647.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/alpha_kappa_alpha_founders_day_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/porijupalo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/56543201989.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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 5236 bytes
SHA-256: 0c77b1f29ffb7fa695ca6ccb2107c5f86f30ffdc6b9382caf5f55e7252101072
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 9844 bytes
SHA-256: b0e877bb9f771ff42df6cfad84af2f177d455126ba4d6afd69dbf58df2a91e39

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