Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaba166d410d2911…

MALICIOUS

PDF

40.5 KB Created: 2020-11-06 23:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 00ab13af6644bdf37b1576f6a3d37e75 SHA-1: 8bbaf25d0701335d3e4744b56fa0dbd32cc92765 SHA-256: eaba166d410d2911d5d5fbc0a6c603fe776c5579b8cf0a441ba68b8bc0ef1979
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents itself as a 'cryptography worksheet for kids' but contains numerous embedded URLs, many pointing to disposable hosting. The 'Password-protected archive lure' heuristic indicates the document likely instructs the user to download an archive, providing the password within the document itself to bypass gateway scanning. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?keyword=cryptography+worksheet+for+kids PDF link annotation
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/mefowebifirudu.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/temokiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f92cbae2a9ce.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/209793.pdfIn PDF document text
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/355e35696.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/savoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f90d94c54615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db70d163-86cb-4d81-b850-d1e3eb664fc2/13396619648.pdfIn PDF document text
    • https://rigimep.files.wordpress.com/2020/11/32239220358.pdfIn PDF document text
    • https://rujimalik.files.wordpress.com/2020/11/xefubageziwurifej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131fa1a3-2552-4b08-8e84-d4ddb3053a39/75372559226.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.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_off00005f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F50 5436 bytes
SHA-256: 1da591dc488c9e7156ef684673ee7b71e7cea1d57ed7c2d9f340fceac42d1d70
font_01_sfnt_off000071e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 10436 bytes
SHA-256: f7ca41bfd1cdff933fb5fe98a02f96463e971afe49fdf3c1fc81293bd7d357f7

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