Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4939060af4ff61…

MALICIOUS

PDF

66.4 KB Created: 2020-12-17 17:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 53e3ca9100d517cb586314638a53bf14 SHA-1: 67bd47f0bc5407716027dc6fb112144541e4f54f SHA-256: 5e4939060af4ff61e50bb4c7261a08bb79bc327b5ec808f3f083ba6b0eb240c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://traffset.ru/strik?utm_term=royal+oaks+elementary', is flagged as suspicious and likely leads to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=royal+oaks+elementary PDF link annotation
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/tobuxevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f9e81884344e.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/7427401.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/688aec11-94f4-41ac-8b64-29cc614c2a11/gemigimuvanuvazafevafofa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/runanutazixab.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/44980350541.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/wadazabamodogumajanuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/xasilixiwuzuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54074a75-bc06-43b8-aa11-e55900078392/38049607115.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/bloodborne_strategy_guide_future_press.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/reporter_young_kurtki_dziewczce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8ea8bf-30eb-4942-84e5-a61a61176ac3/ged_in_spanish_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305ae3cf-7789-4e6d-80ab-55e8100d13b9/64512816282.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/couch_sheets_paper_making.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 5004 bytes
SHA-256: 5bba9d484fd23b633ed54b8f710f97d4dfa4cbdfe72f9d08f5b51507d1363b7a
font_01_sfnt_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 9804 bytes
SHA-256: 13f54a14df34116d8b889528dcf6721fa45c02f4d5f4b8a9f66b10e05d49de45
font_02_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 16076 bytes
SHA-256: a0852c4690a6c7c4be107c8faaea32186891696821b3a96aec1037a99786b2f1

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