Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7570cebf1a3cc99…

MALICIOUS

PDF

79.6 KB Created: 2021-01-30 12:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3ad77a204d6cb611b9b3c88386c83d47 SHA-1: db65de1b540e23757d7c3a9d80a7a8635b687ad5 SHA-256: c7570cebf1a3cc99f30326d11c718c8d750e37cc333245f7fc6f9703d046580e
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://crophysi.ru/123?utm_term=kansas+school+for+the+deaf+athletics', which is likely a phishing lure or a distribution point for further malware. The PDF structure itself appears to be intentionally malformed, with duplicate object bodies, suggesting an attempt to evade detection.

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://crophysi.ru/123?utm_term=kansas+school+for+the+deaf+athletics PDF link annotation
    • http://skidki-day.store/52784859408dg96n.pdfIn PDF document text
    • http://lienforkid.com/south_african_choral_music_songszy0s3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_6007be0922069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5fed3dbc2a506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fe803522f73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5ff16691781ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fd624b469da5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fddcaeb98e12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fed674de47e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fc8351c0159b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fff94f330a62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwejux.epizy.com/warusebafedifirop.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/google_spreadsheet_vlookup_example.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/report_writer_l_g.pdfIn PDF document text
    • http://kafudunafow.epizy.com/admission_form_sainik_school_nagrota.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_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 5080 bytes
SHA-256: 779ee65dc3738a7fbb7de199feb0b8a1cd10d6370eb7dd6a959c92fdaf2cfb59
font_01_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 11144 bytes
SHA-256: 1d6132dfcc596069aa776063a5ebb79be9741de5ced785e8b408e35464c75bfe