Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b410f69670a958…

MALICIOUS

PDF

79.7 KB Created: 2021-05-29 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 70677d71ba829e0fb6c59c5648824279 SHA-1: ec1b45276b4a82bc5788e4b2323967c38ab580fd SHA-256: 54b410f69670a958a2c3a76f8278b4cb54e30c5c6b59f5cd1bfdef84ad1b2129
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content, which is a common tactic for phishing campaigns.

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://zajinet.ru/strik?utm_term=writing+and+evaluating+expressions+worksheet+6th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368237/normal_60286bc60f84c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5fcc2bfc26e41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_6006be3531dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_603084b2f2d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_605f839ba26b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5ff29d856bcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fda641732e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fe4a507ba06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_60568ac7e8272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478952/normal_60681fa1e0132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_6017104f53278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_60560faec33a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7cdbfefb-87f3-461b-8741-dd1b56f353ac/duelo_xiaolin_online_latino_temporada_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ca86f5-74fe-4f44-aad7-fa32f050b0bf/65340978318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c41871-7386-4d2c-bc2e-98187ff5b977/as_vantagens_de_ser_invisvel_filme_completo_dublado_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75df1768-715a-43c5-bc92-ce2a5ef8072c/brene_brown_daring_greatly_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476db903-b8be-4e15-8928-38816581b698/dazopisajunorofiraku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5556 bytes
SHA-256: dfb26e44917b83817a6c13e8dbc042b4aa278213212d4c61cf12023d77cf222c
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10468 bytes
SHA-256: b6e9f50ca536277a418f4c4ef446ab7544ce92d5a3d04992ce0e066113a7a30e
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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