Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbad851432f2eaf…

MALICIOUS

PDF

73.9 KB Created: 2020-11-25 19:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56328ce024af3ecfaddd9022c610c4c4 SHA-1: dab3ed4875488f063126035ab4577c68d3df6efc SHA-256: 2fbad851432f2eafc8b7d8c64bbc1aa48b814425c619b2d13e2a170499b8c2eb
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=henretta+apush+textbook+online+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412181/normal_5fa737b782d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f9f8d8cb38c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f89567fae558.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/4864871.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5fba3349941bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c195e72e-bb9f-4bff-8c37-7cfc98e39427/rebibuwerosunowalorevupit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773155af-83c4-4fdb-a240-b7dcdb3a3f40/that_microsoft_account_doesn_t_exist_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688bdcca-35f0-4de2-b661-c3a50db4687b/century_21_accounting_chapter_13_stu.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/vipumajewowoxogudivoreki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45829e7-af19-47e7-955b-80229dc4c11f/national_physical_therapy_examinatio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49204856-d84d-4cf6-8ee7-7f2a39f99657/bizebunapagosinejafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edf6c78-3331-4426-b75e-5186f81aaf6c/gizogilanugigi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 5360 bytes
SHA-256: 349243a74ebe5bd9523688868bf39625c174230dc1f6c0d05bd215681b39ae99
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 2044 bytes
SHA-256: dedd9ef44456abfe44c7d977340348cf6e06f093193479021ef22f3fda36509b
font_02_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 10872 bytes
SHA-256: 0606a83c0e25e476fe31645b2249f433500b8cadc4e37991ae074d1a56190c98
font_03_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

Open this report in the interactive analyzer, or submit your own file for analysis.