Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5fa49bf492ca08…

MALICIOUS

PDF

80.2 KB Created: 2021-04-07 18:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c8666abe255cde2927c6a1f3c9a5d3df SHA-1: decb895aeb80660ee665f84c4cd70875a1a964cc SHA-256: 8b5fa49bf492ca08e9a5e7e9819d9a081ff2afbc973c1d5c986e6f88a7ee3a32
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to a URL that appears to be part of a link farm. While no scripts were extracted, the structure and heuristics suggest the document's purpose is to redirect users to a network of other documents, potentially for malicious purposes such as distributing malware or conducting phishing attacks. The ML classifier also strongly indicated maliciousness.

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://druttle.ru/wix?keyword=chemistry+test+2+study+guide+answers PDF link annotation
    • http://bagomebefekixob.getenjoyment.net/milo_manara_sketches.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/WojageW/vokajugokov.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/fge74ig/19767277289.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/b8jegeh/bollywood_songs_2020_new_video.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/96105233098.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/aicIDwJ/kumaxawoletejuvabag.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/IwwidD8/logo_maker_logo_creator_generator_designer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gavobawum/sexajelikiberomuvevaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/kagizelak.pdfIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_59f08eaac3e94c2299f8ce3fefc708ba.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a2fc576cfc6d44c7b2f5b7459cd25f53.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_f68ee931899949bcae6d5a2b1ff1907d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/financial_reporting_cpa_course_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/99018773846.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_8626f737c03542be9325c78296a602c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/melijazamitexugeleriwek.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_3e23d48e3bee4bc7a133e5901baa7264.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/letter_h_worksheets_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/19800170981.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_25be97aefbff41d398f5584767ebb2c4.pdf?index=trueIn 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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 5328 bytes
SHA-256: 6a39b3d0c491abc005c23da0ffff8ed68e33f5d53671a31e1413e35b01d73b12
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10196 bytes
SHA-256: db3f6f69453b56ae6247891bf492a426e8d301c64cc6d775877b1dd005ee2e68
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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