Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dcae8571cc83a5…

MALICIOUS

PDF

78.4 KB Created: 2020-11-21 07:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b91c165b372c7fa001ab528ed56c4c8d SHA-1: c34b6022c01bfcfa37d0b7d699cfa6717a4878b4 SHA-256: 02dcae8571cc83a522bc6fac6f5aef7cedd0ed4ef4f8e7e3410599cab32b57cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=openvas+kali+2019 PDF link annotation
    • https://jalekusurasi.weebly.com/uploads/1/3/4/3/134392531/tikaviriluvus-zuxupositufijip-rigorinunisixed-zesojun.pdfIn PDF document text
    • https://sumadapovememer.weebly.com/uploads/1/3/4/4/134494733/00602677b147.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/2827221.pdfIn PDF document text
    • https://wodelegijulafa.weebly.com/uploads/1/3/4/6/134677223/rulijiwal.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/demaxevijinubalulu.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/4284035.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/2710319.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/0ccdac9d-f385-4735-8541-96ed60391c35/kibuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59fcded-ebaa-4f63-bf52-31052e9842f9/75900076294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac1112d-5ca9-43b4-81ea-fcaf6e53c7a3/tokupigofutixudasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b2ea0f-747c-4827-9d09-5b56f74c2769/xepafufuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0157824a-9bec-4fba-a992-9cd467d33bb8/anaconda_explorer_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1156910-8fe5-48af-9488-fe61bfca5eac/intex_sand_filter_pump_model_sf80110_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef23def-57e7-4ec2-9be2-6205b3570b2c/rupek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 7200 bytes
SHA-256: b59454efb8c404e1114c3aa34f994b8acd22655ba96e4b993840e844bdd17efc
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 5352 bytes
SHA-256: ed13aa735263f2187fe84d4de0bdcf9d622f7e38536ad6e9de3eecd3f4167ad2
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 11344 bytes
SHA-256: 626165d7b8534215914444bb6450d8b54c88bfff232bc48ca6e79d581f3fc096

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