Malicious PDF — malware analysis report

Static analysis result for SHA-256 df42623c36e5f27f…

MALICIOUS

PDF

75.6 KB Created: 2021-04-16 21:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6845700a19a4b3e4080956e4e58bbdc1 SHA-1: d0fc7048b599f1e75598cec5ed75dc569dbeadbf SHA-256: df42623c36e5f27f3d086767e79327e62e6b55eb4e34bc6bd705f135a773f24d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to 'sewing for beginners book pdf'. The primary IOC is the external URI which likely serves as a landing page for a phishing attempt or malware download.

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://kuzutuzo.ru/strik?utm_term=sewing+for+beginners+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409797/normal_60067eb89f64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd93ecd3035d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_6032848d00361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5fda0b2aeb166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_60681c402de7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_6028a96448bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_606119ba270ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_6055c2bb2a43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60542bb1adcc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fe8b372632c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_602a258a9ce21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc5a30319717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_6066e74199569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5ff97acb02f9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijamujijupife.epizy.com/fimoniwiza.pdfIn PDF document text
    • http://zanelilituf.epizy.com/estrutura_dos_anticorpos.pdfIn PDF document text
    • http://poxarow.epizy.com/how_to_add_programs_to_casio_fx-9860gii.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 5364 bytes
SHA-256: fc41ac14007635af67cad161a80bfa1c9f935ff1a360172d2109f7e7fd4e3a83
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10788 bytes
SHA-256: 373616b9470803a982d00a8b3d73334e1a7b768ebb66611521428ee748572caf

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