Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59fbb7222212a86…

MALICIOUS

PDF

78.0 KB Created: 2021-05-23 12:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 203ea6f12a4518f6d97a2fb8e7116bd1 SHA-1: cf61b3b40f6efb6c101e11fa0a1d61de9d73efc9 SHA-256: a59fbb7222212a86e2f5c5e7adbc72a8ac93344f32693056883991e4204c2582
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that leads to a suspicious domain, likely serving the malicious content. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=fraction+worksheets+for+grade+4+word+problems+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416923/normal_600bf3350b4b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_603ad045160ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_6009386c7b9a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5ff59ef4651e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_605b35836b92e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_605c634a2651d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fff6f98c0f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_605d9927816d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_6063a1fb879d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_603e94df0c873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495694/normal_5ffc19538daff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_60342edc34dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_60024abe86062.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/rutufokedizon/life_vest_defibrillator_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/how_do_i_change_my_yale_lock_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b737ac-5f2c-4bb1-9bf9-82d795815550/59478931424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1211c327-e63a-4831-bb81-52a81ee971d6/renuzulisozesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a102e91-5aa3-4e02-8a85-12ee1fd20c83/89821790906.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/bug_report_apple_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292596c9-9179-4f1c-b7f5-56111c2601d5/data_mining_software_and_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/1983902343.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5908 bytes
SHA-256: 8557e77ec756b8fa9c9c4bd4718caf49f21bcbe9fa23be0c904d19e56d849607
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10608 bytes
SHA-256: dadc5e11e739699ec5e90434f39384798796a91d449ba1613dea57dfe932a493

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